Address imperfections on the skin with paulas choice resist skin transforming multi correction treatment with azelaic acid bha a multi tasking formula dedicated to improving the look of your complexion fortified with salicylic acid and azelaic acid the anti ageing treatment targets brown spots and blemish pigmentation fading their appearance whilst brightening skin tone overall to leave red marks and old blemishes a thing of the past wrinkles and enlarged pores are reduced and skins te