Value Village ／ Beauty
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Come winter, shins and elbows turn flaky and itchy. Dry skin (kansō-hada) and xerosis (kanpishō) are very common complaints in Japan's dry winter air, and moisturising advice is the most basic part of a dermatologist's guidance here. With the same moisturiser, results change depending on when, where and how much you apply.
| Item | Guide | Reason |
|---|---|---|
| When to apply | Within 5–10 minutes after bathing | Lock in the water the stratum corneum (outer skin layer) took in during the bath before it evaporates |
| Amount (FTU) | 1 FTU (about 0.5 g) covers two palms' worth of skin. About 1 FTU per shin; about 6–8 FTU for both arms and both legs | Guide given in the Japanese Dermatological Association's atopic dermatitis guidelines |
| How often | Once or twice a day. Mornings too in very dry spells | Reapplying keeps water in the stratum corneum |
| Bath temperature | 38–40°C, around 10 minutes | Above 42°C (108°F) or long soaks wash out sebum and moisturising components |
| How to wash | Gently, with hands or a cotton towel. No scrubbing with a nylon towel | Do not scrape the stratum corneum |
| Indoor humidity | 40–60% (the Building Sanitation Management Standard gives 40–70%) | Below 30%, dryness and itching increase |
[Verify] The definition of FTU and the recommended amounts are based on the skincare section of the Japanese Dermatological Association's "Clinical Practice Guidelines for Atopic Dermatitis 2021". Check and quote the relevant passage.
The few minutes after bathing are when the skin holds the most water. Ideally, towel off and apply straight away in the changing area. The longer you wait, the drier the stratum corneum becomes.
Most people are generally described as applying less than half the recommended amount. Measured in FTU, the right amount feels like "this much?".
Most dirt on the body comes off with hot water alone. Scrubbing with a nylon towel scrapes the stratum corneum and is a direct cause of dryness and itching. Hands or a cotton towel are enough.
Bathing at 42°C or above for 15 minutes or more washes out sebum and the moisturising components of the stratum corneum. The skin may feel plump straight after, but the dryness afterwards is worse.
Redness, eczema or cracking may mean dermatitis. If there is no improvement after about two weeks of moisturising, go to a dermatology clinic.
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https://www.dermatol.or.jp/uploads/uploads/files/guideline/ADGL2021.pdf
https://www.dermatol.or.jp/qa/
https://www.mhlw.go.jp/
⚠️ 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.
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.
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