How to Patch Test New Korean Skincare Products
Quick Answer: Test on a 1–2 inch patch of clean skin (inner forearm, behind ear, or jawline). Apply a pea-sized amount of product. Wait 24–48 hours for basic moisturizers, hydrators, and cleansers. For actives (retinol, vitamin C, AHA/BHA), test twice daily for 7–10 days to catch delayed reactions. Watch for redness, stinging, itching, or bumps. … Read more