Also known as furuncles, boils are pockets of pus (a creamy, white substance) on the skin caused by bacteria infecting hair follicles. Cysts—noncancerous sacs of fluid, air, pus, or a soft ...

Boils, also known as furuncles, are hard, painful, pus-filled bumps on the surface of the skin. They are very common and ...

A pimple on your butt could be a boil, which is a hair follicle infection. It could also be keratosis: a skin condition where dead skin cells build up in your hair follicles. Acne on your butt is ...

The issue arises if it gets into an open oil gland or hair follicle, which can cause an infection, resulting in an inflamed pus-filled boil, says Gaither. There are various risk factors that can ...