Active Ingredient: Hydroquinone USP, 4%. Inactive Ingredients: Ascorbic Acid, Dipropylene Glycol, Ethyl Alcohol, Fragrance, Propylene Carbonate, Propylene Glycol, Sodium Lauryl Sulfate, Water.
Apply a thin layer of Obagi-C Rx C-Clarifying Serum to the affected area twice daily or as directed by a physician. If no improvement is seen after 8-12 weeks of treatment, use of this product should be discontinued. Sun exposure should be limited by using a sunscreen agent, a sunblocking agent, or protective clothing to cover bleached skin when using and after using this product in order to prevent repigmentation. Treatment should be limited to relatively small areas of the body at one time since some patients experience a transient skin reddening and a mild burning sensation, which does not preclude treatment.