What are the common misunderstandings about eye make-up hygiene?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Mascara and eyeliner are used right next to the eye, the most delicate mucous membrane on the body. "How long can I keep it?" and "Can I share it?" come up constantly in expat forums. In Japan, eye problems linked to make-up are reported to eye doctors and to the National Consumer Affairs Center of Japan.
Guide after opening
| Product | Guide after opening | Reason |
|---|---|---|
| Mascara | 3 months | The brush carries air and bacteria in every time it goes in and out |
| Liquid eyeliner | 3–6 months | Same as above |
| Pencil eyeliner | About 1 year (sharpen before use) | Sharpening renews the surface |
| Powder eyeshadow | 1–2 years | Dry, so bacteria grow slowly. Wash the applicators and brushes |
| Cream eyeshadow | 6 months–1 year | Touched with the fingers |
| False-eyelash glue | 6 months after opening; follow the label | Many reports of dermatitis |
- Japanese cosmetics that stay stable for 3 years or more unopened are not required to carry an expiry date (Pharmaceuticals and Medical Devices Act — Japan's cosmetics and drugs law), so most products show no date. After opening is a different matter.
- "Tightlining" (インライン, in-rain) — drawing liner on the inner rim inside the lash line, where the meibomian glands are — is sometimes warned against by eye doctors as a cause of blocked glands and dry eye.
- Eyelash extensions may legally be applied only by a licensed beautician (美容師, biyōshi) (MHLW notice, 2008). Eye injuries from unlicensed application have been reported to the National Consumer Affairs Center of Japan.
[Verify] The after-opening guides are general figures based on maker and Japan Cosmetic Industry Association guidance. Check the licence requirement for eyelash extensions against the MHLW notice.
Misunderstanding 1｜If it smells and looks the same, it is fine to use
Bacterial growth in mascara cannot be seen. Replace at 3 months, or sooner if it clumps or starts to dry out.
Misunderstanding 2｜Dried-out mascara can be thinned with water or skin lotion
Adding water makes bacteria grow faster, and the ingredients of a skin lotion are not designed to go in the eye. When it dries out, replace it.
Misunderstanding 3｜It is fine to use a tester or a friend's mascara
It can cause eye infections such as conjunctivitis. Do not share eye make-up, and at the counter use disposable brushes and applicators on testers.
Misunderstanding 4｜Tightlining is the Japanese eye look
Liner on the inner rim of the lashes can block the glands and cause dry, inflamed eyes. Drawing it outside the lash line is the safer choice.
Misunderstanding 5｜Lash glue is a cosmetic, so it is safe
The main ingredient of the glue is cyanoacrylate, and there are reports of dermatitis, red eyes and corneal damage. Patch-test it, and have extensions applied by a licensed professional. If anything goes wrong, see an eye doctor (眼科, ganka) straight away.
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Sources
- Ministry of Health, Labour and Welfare, "Thorough prevention of harm from eyelash extensions" [まつ毛エクステンションによる危害防止の徹底について] (notice, 2008)
https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/kenkou/seikatsu-eisei/
- National Consumer Affairs Center of Japan, "Harm from eyelash extensions" [まつ毛エクステンションの危害]
https://www.kokusen.go.jp/
- Japan Ophthalmologists Association, "Eye make-up and eye health" [アイメイクと目の健康]
https://www.gankaikai.or.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.
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.
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