Sulfur –the same stuff that forms the tip of a match stick – has been used for centuries to treat skin conditions like acne, rosacea and warts. The secret to sulfur’s success is that it causes the skin to dry and peel. It dries up oiliness and helps to keep pores from getting clogged. Possible side effects include drying, peeling, redness and burning which are most noticeable when you first begin treatment. There are two general strategies. The first is to start slowly, and build up to the recommended dose. The second is to scale back on your usage and rebuild to the recommended dose. Some find the smell of sulfur to be particularly noxious (rotten eggs) but the scent can vary by from brand to brand.