A boil looks like a large pimple—a swollen ring ... Lancing is also used to treat swollen, infected cysts. The only way to ensure cysts don't grow back is surgery to remove them entirely.

Pilonidal sinus—also called a pilonidal cyst—is a skin infection that occurs in or around the crease of your buttocks. This condition happens when hair, skin cells, and dirt clog a hair ...