Aziclear Serum is generally well-tolerated and designed to help lighten blemishes, reduce pigmentation, and improve skin tone. Some users may experience mild stinging, redness, or dryness when first using it, which is normal as the skin adjusts to active ingredients such as azelaic acid, resorcinol, ferulic acid, and HPPA. To minimise risks, patch test first, start slowly, use daily sunscreen, and consult a dermatologist if you notice irritation or other reactions.