Sulfur (Sulphur), also spelled sulphur, nonmetallic chemical element belonging to the oxygen group of the periodic table, one of the most reactive of the elements.
Sulfur helps dry out the surface of your skin to help absorb excess oil (sebum) that may contribute to acne breakouts. It also dries out dead skin cells to help unclog your pores. Some products contain sulfur along with other acne-fighting ingredients, such as resorcinol.