Medically reviewed by Susan Bard, MD Boils are painful, pus-filled, and are caused by infections like Staphylococcus aureus.Cysts are painless, non-infectious growths filled with keratin or other ...

A boil on your butt may be fluid-filled, itchy, or painful. An infected or inflamed hair follicle, called folliculitis, is the main cause of boils. Treatment for boils may include home remedies and ...