Hello. Medicine and creams works for the acne that has happened already. Peeling help in reducing the sebum content , and so it will prevent d occurrence of new pimples and reduces d marks too. It depends on Wat type of peel used. . Swelling won't be there. There might be mild redness for few days and few precautions has to be taken depending onvd peel. Thank u. If any queries visit my clinic or contact 8884671981