Obagi CLENZIderm MD unclogs your pores without leaving behind unwanted residue – and clears away dead skin cells to prepare your skin to deeply absorb liquefied serum that targets acne. When used as part of the Obagi line of acne skin care products, CLENZIderm is clinically proven to improve skin in as little as one week and to prevent future lesions and breakouts. Cleanse skin thoroughly before applying medication. Moisten a cotton ball with the Clenziderm MD Pore Therapy smooth the cotton ball over your face. Use morning and night. Allow to dry. If bothersome drying occurs, reduce application to once a day or every other day.