Apply a thin, even layer to clean, dry skin on the face, avoiding the eye and lip areas. Leave on for no more than 10 minutes. Rinse thoroughly with lukewarm water and gently pat dry. Use once or twice per week, ideally in the evening. A slight tingling sensation is normal. Always apply a broad-spectrum sunscreen during the day, as BHAs increase sun sensitivity. Not suitable for sensitive, peeling, or compromised skin. Patch testing prior to first use is recommended.