Sumadan (sulfacetamide sodium/sulfur) belongs to a class of medications known as Topical antibiotics. Sumadan is normally used for treating acne, seborrhea, and rosacea. Sumadan may also be used for other conditions as directed by the patient's physician. Sumadan is basically a combination sulfonamide antibiotic and keratolytic. Sumadan is packed with a skin cleanser and functions by killing bacteria.