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Dermapen 4 has the effect of regenerating skin and anxious pain and downtime




Satoshi Hashimoto
Dr. Satoshi Hashimoto

Certified by the Japanese Society of Cosmetic Surgeons Dermapen World Certified Dermapen 4 Technical Instructor suneKOS executive trainer in Japan Classys Certified Ultraformer 3 Instructor Endymed Certified Technical Instructor

Medical institution with Dr. Satoshi Hashimoto

Skin refine clinic Skin Refine Clinic Hiroo
Contact: 0120-440-138

Dr. Satoshi Hashimoto, the director of Skin Refine Clinic Hiroo, has been appointed as an instructor by the Australian company Dermapenworld, which developed Dermapen. He gave many lectures to doctors and energetically carried out activities to disseminate correct treatment methods. Since he is familiar with the characteristics of the machine and performs careful treatment, he is also an instructor of not only Dermapen 4 but also the slimming machine Kratou Alpha and Ultraformer 3.

Woman with hands on cheeks

Treatment with Dermapen 4 utilizes our natural "natural healing power" . By making a fine hole in the skin surface with a needle as fine as a hair, it promotes natural healing to repair the needle hole. Dermapen 4 is used to create ideal high-density needle holes of appropriate size and depth to regenerate the entire skin, improve pore openings, acne scars, fine wrinkles, and scars and stretch marks. You can expect improvements.

In order to realize the effect of Dermapen 4 more, before the treatment, know the difference between the conventional Dermapen, similar products of other companies, and the similar treatment Dermaroller, the effective treatment frequency, and the type of concomitant drug that enhances the effect. Must be kept.

Dermapen 4 for skin regeneration and skin quality improvement

Woman looking in the mirror

Dermapen 4 Dermapen 4 is the 4th generation Dermapen developed by Australia's Dermapenworld and released in 2019 in Japan, and is the latest model of Dermapen.

By moving the needle up and down at a high speed, which is said to be 120 times per second, an invisible fine needle hole is made on the skin surface.

By properly making holes of 1,920 (16 needles x 120 times) per second in size and depth, the natural healing power to repair the opened needle holes works. Growth factors that activate cell activity to heal wounds are secreted, and fibroblasts, which are the source of collagen, elastin, and hyaluronic acid, activate skin turnover . As a result, the aged skin is regenerated in the process of repairing the wound, improving acne scars and scars, and acting on fine wrinkles to lead to firm skin.

A treatment method such as Dermapen 4, which intentionally creates a wound on the skin with an extra-fine needle and utilizes the natural healing power of the skin, is also called "microneedling".

Dermapen 4 can be used for small areas and thin skin areas.

The diameter of the tip with the needle at the tip of the machine is about the size of a fingertip, so it is possible to treat complicated parts with curves such as the nose and small parts such as lips.

Adjust the needle stick depth in 0.1 mm increments

With Dermapen 4, the depth of needle stick is adjusted in 0.1 mm increments between 0.2 mm and 3.0 mm, and the treatment is performed according to the thinness of the skin and skin problems. By doing so, it is possible to perform treatment on areas with thin skin such as around the eyes.

Treat scars in scar treatment mode

Dermapen 4 is equipped with a scar treatment mode (ST mode), which is a scar healing (hankonchiyu) mode, as a new function, making it possible to focus on the treatment of crater-like acne scars and scars . In ST mode, it is necessary to move the needle not only vertically but also intentionally diagonally, so it is done only by the doctor, not the nurse.

Treatment effect that increases in combination with drugs

The drug penetrates evenly from the fine needle holes to the depths of the skin When Dermapen 4 is combined with a drug that promotes cell growth and repair, the drug's effect is further enhanced by evenly penetrating the drug from the fine needle holes to the depths of the skin.

The barrier function works on human skin to prevent the invasion of bacteria from outside the body. While the barrier function blocks the entry of foreign substances, the active ingredient applied to the skin stays on the surface of the skin and cannot penetrate deep into the skin.

However, by making a needle hole in the skin at high speed with Dermapen 4, the drug that originally does not penetrate just by applying it penetrates deep into the skin. This effect is called "drug delivery" .

Those who are suitable for symptoms / treatments that can be expected to improve with Dermapen 4

Women's eyes up

  • Those who are worried about the opening of pores
  • Those who are suffering from skin irregularities (craters) such as acne scars
  • Those who are worried about wrinkles and fine wrinkles around the eyes
  • Those who are worried about stretch marks and stretch marks
  • Those who want to regain the firmness of the skin and adjust the texture
  • Those who want to improve the roughness of the skin
  • Those who want to improve the transparency and moisture of the skin
  • Those who want to improve scars
  • Those who are suffering from alopecia areata

Areas that can be treated with Dermapen 4

  • All faces (nose, cheeks, lips, around the eyes)
  • neck
  • Upper arm
  • Back of the hand
  • Abdominal circumference (stretch marks, stretch marks)
  • breast
  • back
  • scalp

* Almost all areas can be treated, so please consult your doctor for areas other than the above.

Dermapen 4 drug delivery enhances treatment effect

A major feature of Dermapen 4 is that the combination of drugs has the effect of delivering the nutrients of the drugs to the depths of the skin and absorbing them.

By combining drugs that suit the purpose, such as normalizing the turnover cycle, which is the metabolism of skin cells, and increasing elastic components such as collagen and hyaluronic acid, it leads to healthier skin quality.

The option menu includes a menu in which the drug is applied at the same time as making a needle hole with Dermapen 4, and a menu in which a separate treatment is performed after the treatment of Dermapen 4.

Types of drugs to be applied at the same time as Dermapen 4 treatment

Various chemicals

Growth factors for skin regeneration

Drugs that are combined with Dermapen 4 treatment include drugs that contain growth factors called growth factors and cytokines. Growth factors are a type of protein that is naturally present in the body and has the function of controlling cell activity, such as activating cells in the body and promoting cell division .

It is an effect that can be expected to improve wrinkles and sagging by recovering elasticity and elasticity, improve acne scars, tighten pores, heal wounds, and grow hair.


In addition to eight types of growth factors such as fibroblast growth factor (FGF) and epidermal growth factor (EGF), hyaluronic acid, amino acids, peptides, and vitamins are blended to promote turnover and activate fibroblasts. Let it replace the old collagen with new collagen.

Amnio Genix

The main component is a thin membrane made of collagen obtained from the placenta called "human amniotic membrane" that encloses the fetus, and is said to contain more than 285 growth factors. Many medical institutions cost more than 100,000 yen when used in combination with Dermapen 4, but it tends to have a high treatment effect and is also suitable for thinning hair treatment.


With abundant active ingredients such as growth factors, peptides, amino acids, and coenzymes, it nourishes the skin and strongly promotes skin regeneration, so it can be expected to be effective against atopic dermatitis.


Stem cells, which create new cells, are rich in growth factors, which enhances their natural healing power and promotes skin regeneration. A beauty essence that contains a high concentration of umbilical cord stem cell culture solution, which is the active ingredient of the skin. Some medical institutions sell it for about 10,000 yen, and it can also be used as a home care product.

Collagen booster that promotes collagen production

Collagen booster (PCL / polycaprolactone) acts on fibroblasts that produce collagen / elastin / hyaluronic acid to promote the production of its own collagen, and replaces old collagen with new one to promote skin regeneration . It gives firmness and can be expected to improve wrinkles and unevenness of the skin.

Hyaluronic acid, high-concentration vitamin C, etc.

In addition to growth factors and collagen boosters, drugs such as hyaluronic acid, botulinum toxin, tranexamic acid, and high-concentration vitamin C can also be used.

Option menu to be implemented after Dermapen 4 treatment

Massage peel

The treatment that combines Dermapen 4 and massage peel (collagen peel / Milan peel) is also called "velvet skin" because the skin feels smooth after the treatment like velvet, which is a high-quality fabric .

Massage peels act on fibroblasts to support their own collagen production. As a result, you can expect the effects of tightening pores, improving fine wrinkles and acne scars, and smoothing the texture of the skin.

After the treatment of Dermapen 4, apply "PRX-T33", which is a massage peeling agent, to the skin while massaging it, soak it in and wipe it off. When you apply the drug, you may feel a tingling sensation and redness may occur.

Medical beauty pack (SRS mask)

A sheet mask containing growth factors that act on beautiful skin, such as fibroblast growth factor (bFGF) and epidermal growth factor (EGF). The effects of bFGF, which activates fibroblasts and accelerates the healing time of wounds, and EGF, which restores the turnover cycle to normal, can be expected .

By wearing a sheet mask after the treatment of Dermapen 4, growth factors permeate through the needle holes, increase the ability to heal wounds, and lead to healthy skin with good gloss.

There are 4 types of dermapen serum

Dermapen has four types of special beauty essences, each of which has different expected effects, so use a blend of the necessary beauty essences according to your skin condition. Some medical institutions sell bottles for home care at home.

Essence Action
Hyra Active
(Hyla Active)
The high concentration of hyaluronic acid improves the water retention of the skin and promotes the moisturizing effect, and the anti-inflammatory effect of zinc suppresses redness and inflammation.
Antioxidant cocktail
Antioxidant contains many antioxidants, as anti is "resistance" and oxidant is "active oxygen". Repairs photoaging such as sunburn caused by ultraviolet rays.
Bright light
The formation of melanin pigment is prevented by a component that suppresses the action of an enzyme called tyrosinase involved in the production of melanin pigment.
Vitamin rich repair
It contains a lot of vitamins such as retinyl palmitate and retinyl acetate, and has an antioxidant effect to prevent skin oxidation by ultraviolet rays.

Compare Dermapen 4 with other treatments

Difference from the conventional Dermapen

Treatment time shortened

The conventional Dermapen 3 has 12 needles at the tip, but the Dermapen 4 has increased to 16 needles. As a result, it became possible to make more holes in a short time, and the treatment time was shortened.

Needle depth added to work on shallow and deep layers

In addition to the scar treatment mode of 3.0 mm, which is a scar healing mode, 0.2 mm has been added to the depth of the needle, making it possible to treat areas with thin skin such as the eyes. Since the needle depth of Dermapen 3 was 0.25 mm to 2.5 mm, Dermapen 4 can be applied to shallower and deeper layers than Dermapen 3 .

Risk measures for perfected infectious diseases

Treatment with Dermapen may cause bleeding depending on the thickness of the skin and the depth of the needle, and cases of suspected nosocomial infections such as HIV virus and hepatitis virus have been reported overseas with the treatment with Dermapen. I will. Therefore, it is necessary to take all possible measures against infection so that the equipment will not be soiled by bleeding.

The main body of the device is difficult to disinfect, but with Dermapen 4, the treatment is performed by attaching a disposable special cover to prevent infection. Since it is removable, check with your medical institution to see if a special cover is attached when you undergo the procedure. In addition, with Dermapen 4, the structure of the disposable tip with the needle has been significantly improved, and we have succeeded in completely shutting out blood from entering the inside of the main body along the periphery of the needle.

As recommended by the developer, if the usage method of attaching a disposable special cover and using a new needle for each treatment is followed, it can be said that the medical device is fully considered for infection control .

Difference from the treatment effect of Dermapen for home use

Derma stamps, derma rollers, and self-derma pens for home use, which are similar devices to dermapen used in medical institutions, are generally sold, but they are designed so that the needle does not stick deep into the skin so that they can be used safely at home. It has become. Since it is difficult for the general public to obtain an appropriate drug according to the symptom, it is difficult to obtain the same treatment effect as the treatment performed by a doctor at a medical institution.

In addition, since the procedure involves piercing the skin with a needle to damage it, using it without correct knowledge increases the risk of bacterial infection and may cause problems such as rough skin. It is recommended that you receive the treatment at a medical institution so as not to hurt your skin.

Less downtime than fractional lasers

Fractional lasers use the power of the natural healing power of the surrounding skin tissue to make innumerable punctate holes in the skin with a laser instead of a needle. The mechanism of utilizing adaptive symptoms and natural healing power is similar to Dermapen 4, but the treatment fee tends to be higher than Dermapen 4 .

In addition, when the fractional laser irradiates the laser with high output, the heat stays in the skin and the irradiated area becomes burned. The higher the output, the more effective the treatment can be expected, but the redness and swelling of the skin may continue for about a week, and the downtime tends to be longer than that of Dermapen 4.

Dermapen 4 can be expected to have the same treatment effect as a fractional laser, and normal makeup can be applied from the next day.

Evener treatment is possible than Derma Roller

Comparison between Dermapen and Dermaroller Derma Roller makes a small hole while rolling a roller with a fine needle on the skin, and promotes collagen production with the natural healing power to repair the wound, leading to improvement of skin troubles. The principle is the same as Dermapen 4, but it is difficult to keep the depth of the needle constant because the roller is moved by human hands, and by rolling the roller, the needle sticks diagonally and rolls like scooping the skin. There is a lot of unnecessary and useless damage to the epidermis, and redness and swelling tend to be prolonged .

Since the Dermapen 4 is an electric type that the needle sticks vertically, there is less unnecessary damage to the epidermis , and despite the higher density of needle holes , the burden and pain on the skin is reduced.

Difference from water light injection that injects the active ingredient

Both water light injection and Dermapen 4 are similar in that they use machines with multiple needles, but they have completely different purposes. Water light injection is an injection device that injects the active ingredient into the skin, while Dermapen 4 is a treatment that aims to improve skin problems by utilizing the natural healing power of the skin to repair wounds.

With Dermapen 4, by adding the drug of the active ingredient of the skin to the treatment, it is possible to take in the active ingredient while trying to regenerate the skin .

Precautions regarding risks and side effects of Dermapen 4

Woman with a surprised face

Treatment history in other cosmetology

Before the Dermapen 4 treatment, the condition of the skin is checked and the depth of the needle is determined. Therefore, if you are undergoing injection treatment such as hyaluronic acid, irradiation treatment such as IPL or laser, or other cosmetic medical treatment, Please tell the doctor when you received the treatment and the details of the treatment at the time of counseling.

Pain and downtime during Dermapen 4 procedure

Dermapen 4 Pain during treatment

Some people are worried about the pain associated with the procedure when they hear "a procedure to make a hole in the skin with a needle", but since it is performed by applying an anesthetic cream, it will tingle when the skin is thin or the needle is deeply pierced. I feel pain . If you are vulnerable to pain, please consult your doctor, such as having the needle adjust the depth while checking the pain during the procedure.

Downtime after Dermapen 4 treatment

It is said that there is almost no downtime because the needle holes made by Dermapen 4 are fine and the burden on the skin is small, and the skin recovers quickly after the treatment. However, depending on the condition of the skin, symptoms such as redness and itchiness, peeling of the epidermis, and scabs may continue for about 3 days immediately after the procedure .

Risks and side effects of Dermapen 4

  • In rare cases, people with thin skin or those with a constitution that tends to leave scars may have internal bleeding, and it may take about a week to settle down.
  • For about 3 days immediately after the procedure, dry skin, redness and stiffness may occur, but it can be covered with makeup.

With Dermapen 4, a special cover has been developed that can be attached to the device itself, and the tip with the needle is disposable, avoiding the risk of infection.

Those who cannot receive treatment / parts that cannot be treated

Those who meet the following items may not be able to receive the treatment, so please consult your doctor in advance.

  • Pregnant / lactating
  • Those with keloid constitution
  • Those who are allergic to anesthetics
  • Those with metal allergies
  • Those with infectious diseases
  • Those who are prone to telangiectasia / bleeding
  • Those with diabetic complications and serious illness
  • Areas with strong atopic dermatitis, eczema, rashes, redness, and itching
  • Sites with pus-related acne (can be treated if inflammation has subsided)
  • Areas with strong pigmentation after sunburn

Dermapen 4 treatment fee market price

Dermapen 4 is an unapproved device of the Ministry of Health, Labor and Welfare. Since it is a free medical treatment and the treatment is aimed at beauty, medical insurance is not applied and you will have to pay the full amount.

It costs about 15,000 to 50,000 yen for the whole face treatment with Dermapen 4 alone. When adding an option menu, it depends on the drug and treatment, but about 10,000 to 100,000 yen will be added to the treatment alone.

Treatment by a doctor and treatment by a nurse

Overseas, it may be performed by an esthetician, but in Japan, it is performed by a doctor or nurse who has knowledge of prevention of infectious diseases. The fee for the treatment by the nurse is set lower than the treatment by the doctor, but the treatment in the scar treatment mode, which is the deepest needle depth, is limited to the doctor because it acts deep on the skin and the dermis layer .

Dermapen 4 treatment frequency and treatment frequency

Dermapen 4 may be effective with a single treatment, but some medical institutions set a course fee to improve the effect and lead to a healthy skin condition. It is recommended to repeat the treatment once a month, about 3 to 5 times .

Cosmetology that can be used in combination with the procedure of Dermapen 4

The treatment time is about 1 hour for the entire face, including the penetration time of anesthesia.

(1) Counseling / examination

A medical examination will check the condition of the skin and see if the symptoms and areas are suitable for treatment. At that time, tell the doctor in detail about the skin problems you want to improve, and decide on the growth factors and other drugs to be introduced as needed.

(2) Remove makeup to cleanse the skin

When treating the face, remove makeup completely to keep the skin clean before the treatment. When performing treatments on the arms and abdomen, disinfect and clean the treatment area before receiving the treatment.

(3) Application and penetration of anesthetic cream

Apply anesthetic cream to the area to be treated and allow 30 to 40 minutes for it to penetrate. The duration of the anesthetic cream varies from person to person, but it is said to be about 1 to 3 hours, and the effect of anesthesia gradually disappears.

(4) Dermapen 4 treatment

Wipe off the anesthetic cream. In the case of the whole face, the treatment is performed by dividing the forehead, around the eyes, around the cheeks, around the nose, and around the chin, and adjusting the depth and speed of the needle according to the thickness and condition of the skin. I will.

(5) Application of optional chemicals

We will perform menu treatments that are performed in combination with the application of optional drugs.

(6) Finish

After the treatment, redness and burning may occur, so cool down with a cooling mask to soothe the skin. You can take a bath or wash your face from the day of the treatment, but please follow the doctor's instructions for precautions after the treatment.

Aftercare after treatment

  • You can wash your face, wash your hair, and shower from the day of the event.
  • If you are concerned about fire, cool it with an ice pack.
  • If you have a scab, do not force it off and wait for it to come off naturally.
  • After the treatment, the skin is sensitive to irritation, so avoid rubbing the skin.
  • Since the skin after treatment is easy to dry, please give proper moisturizing care with lotion or cream. In particular, sunburn can cause pigmentation, so it is necessary to take thorough measures against UV rays.
  • Please refrain from drinking alcohol, strenuous exercise, sauna, etc. for about 3 days after the treatment, as downtime may be prolonged if blood circulation improves.

For makeup after treatment, use a foundation exclusively for Dermapen 4.

Dermapen 4 has a foundation "DP Cover Recover" exclusively for Dermapen in 6 colors. Since it contains cooling ingredients and UV protection ingredients, it can be safely used on the skin after Dermapen 4 treatment, which is sensitive to irritation, and aftercare can be performed while covering redness.

Cosmetology that can be used with Dermapen 4

Drugs such as growth factors can be added as an option menu, and can also be used in combination with cosmetology.


By receiving treatment at the same time as the injection of Snekos, which has the effect of promoting the growth of collagen and elastin, which are responsible for the firmness and elasticity of the skin, a synergistic effect that leads to improvement of skin quality can be expected. Snekos is a highly safe preparation that contains hyaluronic acid, which does not contain chemical substances such as cross-linking agents, and 6 types of amino acids, and substances that originally exist in the human body are used.


If you have a peeling treatment to remove dead skin cells and sebum before Dermapen 4, you can expect the effect of natural healing power of Dermapen 4. Cosmetological treatments that have a peeling effect include peeling with a chemical that applies acid to the skin and wipes it off, as well as treatment with the peeling machine "Hydra Facial".

Pico laser

After the Dermapen 4 treatment, the pico laser treatment will improve the effect of improving spots, chloasma, and dullness. Pico Laser is a laser machine that crushes the melanin pigment that causes blemishes and discharges it to the outside of the body to treat blemishes with short downtime while minimizing damage to the skin.

To receive effective treatment with Dermapen 4

Male and female doctors

Treatment with Dermapen 4 may cause bleeding depending on the depth of the needle. Even with self-dermapen performed at home, inflammation due to bacteria may occur if proper measures are not taken at the time of bleeding, so wear a special cover firmly and receive treatment at a medical institution that claims risk measures for infectious diseases. Please give me.

In addition, if the Dermapen 4 is not treated properly, it will damage the skin and prolong downtime, and the treatment effect will be weakened. It is safe to have a doctor who has a doctor who received a lecture directly from the training doctor of the developer Dermapen World.

Skin Refine Clinic Hiroo Dermapen 4

Professor Satoshi Hashimoto, who supervised the article, taught me about Dermapen 4.

Are there any symptoms that make it easier to feel the effects of Dermapen 4?
Dr. Satoshi Hashimoto
Because it is a treatment that regenerates the skin, it is often used to treat acne scars. If the crater-like acne scars with irregularities are also severe, you may be able to smooth them even with a single treatment by piercing the needle deeply.
Collagen is produced in the process of making holes with a needle and healing each needle hole, so not only the acne scars are improved, but also the skin becomes firmer, fine wrinkles are improved, and pores are tightened.
How much is the pain?
Dr. Satoshi Hashimoto
Some people receive it without anesthesia, but it is safe to receive it with anesthesia.
Please tell me the recommended option menu.
Dr. Satoshi Hashimoto
First of all, it is recommended to use a growth factor drug that promotes repair. At Skin Refine Clinic Hiroo, we are using the SHINE DERM pack developed for the care after Dermapen 4 on the evening of the day. A biocellulose mask exclusively for Dermapen 4 developed for the purpose of promoting skin regeneration and improving the balance of indigenous bacteria on the skin (skin flora). By combining it with the Dermapen 4 treatment, you will be able to experience the effects of skin regeneration more. I will.
Please tell me the price at Skin Refine Clinic Hiroo.
Dr. Satoshi Hashimoto
The entire face is 45,000 yen (excluding tax). Dermapen 4 is an unapproved device of the Ministry of Health, Labor and Welfare. It will be a free medical treatment and you will have to pay the full amount.
What is the downtime?
Dr. Satoshi Hashimoto
Redness will appear on the day. The next day will be quite calm, so you won't have to worry if you put on make-up the next day or later. To be on the safe side, it's a good idea to refrain from performing the procedure a few days before your important appointment.
Precautions ・ Please tell me about aftercare.
Dr. Satoshi Hashimoto
Immediately after that, it's a good idea to use a foundation exclusively for Dermapen to prevent redness while taking measures against UV rays. The needle hole closes within a few hours after the procedure, so you can apply your usual makeup after that.
What kind of medical institution / doctor should I choose to receive Dermapen 4?
Dr. Satoshi Hashimoto
Select a medical institution that has a special cover and disposable needles, which is recommended by the developer to take measures against infectious diseases.
Dr. Satoshi Hashimoto
Also, just because you have a good machine, you can't get the effect unless you do it the right way. Since I am the only instructor of Dermapen 4 in Japan, I am conducting educational activities on how to handle Dermapen 4 correctly by holding a lecture for doctors. Select a doctor who actively participates in study sessions and lectures to deepen your knowledge.
Dr. Satoshi Hashimoto
The treatment effect and downtime also differ greatly depending on how the practitioner's machine is moved, so if you do not get the desired course or results, you may want to try it at a different medical institution.
Please give a message to those who are wondering whether to receive Dermapen 4 from now on.
Dr. Satoshi Hashimoto
This treatment is most effective not only for those who are suffering from acne, acne scars, and pore opening, but also for those who pursue beautiful skin. The skill of the technician will greatly affect the downtime and effectiveness after treatment, more than you expected.
Dr. Satoshi Hashimoto
Since it is important to use Dermapen 4 that has undergone various evolutions accurately, (1) consideration for the risk of nosocomial infection, (2) experience of receiving technical training, and (3) reason for choosing a concomitant drug (why my symptoms) It is recommended that you receive sufficient explanation about the three points of (whether this drug is used in combination) and receive treatment at a reliable facility.
Thank you Professor Hashimoto!

Medical institution with Dr. Satoshi Hashimoto

Skin refine clinic Skin Refine Clinic Hiroo
Contact: 0120-440-138

Dermapen 4 is an unapproved device of the Ministry of Health, Labor and Welfare.
Medical device acquisition route: The acquisition route is individual import from the manufacturer by the doctor of each medical institution.
Drugs that should be noted in personal imports (Ministry of Health, Labor and Welfare page)

Approval in Japan: There is no medical device that has the same performance and effect as Dermapen 4 and has been approved in Japan.

Information on safety, etc. in other countries : The following are common side effects reported in other countries.
Redness, bleeding, internal bleeding, bruising, infection, dryness, stiffness at the treatment site

[Directly transmitted by the instructor] Features of Dermapen 4 and the correct flow and points of treatment [Cosmetology]