How do I patch test a new skincare product?

Apply a small amount of the new product to a discreet area — the inner arm or behind the ear — and wait 24–48 hours. If no redness, itching, or irritation occurs, it is likely safe for facial use. For higher-risk individuals, try the product on the jaw or neck before the full face. Patch testing is especially important for chemical exfoliants, retinoids, and fragranced products.