What are the common misunderstandings about exfoliation (scrubs and peels)?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
"Removing" dead skin is one of the most divisive topics in overseas skincare communities. In Japan, the most a cosmetic exfoliant may claim is that it "removes old dead skin cells" — nothing beyond that is allowed. This article explains what that means for the products on drugstore shelves (Matsumoto Kiyoshi, Welcia, etc.) and how people here use them.
What to base your decision on
| Type | How it works | Frequency guide (follow the product label) | Watch out for |
|---|---|---|---|
| Scrub (physical) | Particles rub the surface off | Once or twice a week | Rubbing too hard; coarse particles |
| Wipe-off toner (拭き取り化粧水, fukitori keshōsui) | Alcohol or acid wipes the surface | Daily-use to a few times a week | Irritation from alcohol |
| AHA / BHA products (chemical) | Acids loosen dead cells | From once or twice a week | Sunscreen is essential; do not layer with other irritating actives |
| Enzyme face wash (酵素洗顔, kōso sengan) | Protein-digesting enzymes | Once or twice a week | Go easy if your skin dries out easily |
- The stratum corneum is generally described as about 0.02 mm thick, with cells renewing on a cycle of roughly 28 days (longer with age). Removing too much means outrunning that cycle.
- The effects a cosmetic may claim are within the 56 items, such as "removes old dead skin cells" and "smooths the skin". "Normalises skin turnover" cannot be said of a cosmetic under the Pharmaceuticals and Medical Devices Act (Japan's cosmetics and drugs law).
- Chemical peels at a medical clinic are a medical procedure; the concentrations and purpose differ from cosmetic products.
[Verify] The thickness and renewal cycle of the stratum corneum are general dermatology descriptions; check against Japanese Dermatological Association materials. The 56 items are in MHLW notice Yakushoku-hatsu 0721 No. 1.
Misunderstanding 1｜Scrub every day and your skin stays smooth
Over-scrubbing thins the stratum corneum and leaves skin dry, red and easily irritated. Follow the frequency on the label and cut back according to how your skin feels.
Misunderstanding 2｜Stinging means it is working
It is an irritation reaction. The rule is to rinse it off at once and stop using it. If it persists, see a dermatology clinic (covered by Japanese health insurance).
Misunderstanding 3｜Acid peels are fine without sunscreen
Skin whose dead cells have been loosened by acid is generally described as more vulnerable to UV. The usual practice is to wear sunscreen over it in the daytime, or to use the product at night.
Misunderstanding 4｜Layering several exfoliants works faster
Stacking irritants — scrub plus acid plus a retinol-type product — is the classic route to skin trouble. Try one type at a time, with a gap between them.
Misunderstanding 5｜Dark spots and roughness are dead skin, so remove it and they go
Dark pores are often oxidised sebum, and roughness is often dryness; exfoliating may change neither. Work out the cause first (see our article on pore care).
---
Sources
- Ministry of Health, Labour and Welfare, notice "Revision of the scope of cosmetic efficacy claims" [化粧品の効能の範囲の改正について] (Yakushoku-hatsu 0721 No. 1)
https://www.mhlw.go.jp/file/06-Seisakujouhou-11120000-Iyakushokuhinkyoku/kesyouhin_hanni_20111.pdf
- Japanese Dermatological Association, "Dermatology Q&A" [皮膚科Q&A]
https://www.dermatol.or.jp/qa/
- Japan Cosmetic Industry Association, "Guidelines for Appropriate Advertising of Cosmetics" [化粧品等の適正広告ガイドライン]
https://www.jcia.org/user/business/advertising
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Cosmetics are not medicines and are not meant to diagnose, heal or prevent any condition. If your skin reacts, stop using the product and see a dermatologist.
Sources
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