Oct 29, 2026
10 min
5 steps
How to Test a New Skin Care Product on a Small Area
Set up a small-area trial for a new ordinary cosmetic, keep a 7–10-day record, and know when to stop or ask a dermatologist.
Set up a small-area trial for a new ordinary cosmetic, keep a 7–10-day record, and know when to stop or ask a dermatologist.