Make sure the skin has been cleansed with Cleanser, apply Toner to reduce the pH level of the skin. Wear gloves while applying the enclosed applicator, which contains the Glycolic Acid. Start at the periphery of the face and proceed to the more central areas. Leave on no longer than 2 to 3 minutes before rinsing with liberal amounts of cool water. Mild stinging and light erythema may persist for approximately 30 minutes. No cosmetic products should be used for three (3) hours after application, apart from Expert Renew Cream. Use a sunscreen SPF 50 and limit sun exposure while using this product and for a week afterwards. For use by skincare professionals. For external use only. Avoid contact with eyes. If the product gets into eyes rinse with water. Discontinue use if irritation occurs. Keep out of reach of children.