Ingredient caution: niacinamide is usually gentle but might cause tingling or flushing in very reactive skin; sulfur/zinc-based oil-control ingredients might feel drying or tight on already dry skin; UV filters might sting around the eyes or irritate very sensitive skin; cleansing surfactants might cause dryness, stinging or tightness if overused. Do a patch test before applying. Start slowly if your skin is sensitive and avoid combining too many new actives at once. Use a moisturiser and reduce frequency if the skin feels tight or flaky. Patch test near the jawline first, avoid the eye corners, and remove gently at night. Use lukewarm water, do not scrub, and follow with moisturiser. Stop use if irritation persists.