Boils are painful, pus-filled, and are caused by infections like Staphylococcus aureus. Cysts are painless, non-infectious growths filled with keratin or other substances. Antibiotics may treat boils ...

A painful bump on or around the ear may be a boil, which occurs when a bacterial skin infection develops in a hair follicle or oil gland. Over time, pus collects in the lump. Boil sometimes go away, ...

Katlein Franca, MD, is a dermatologist and clinical associate professor of Dermatology & Cutaneous Surgery and Psychiatry & Behavioral Sciences at the University of Miami. Boils start as tender bumps ...