Most boils are caused by staphylococcal bacteria that infects hair follicles or oil glands, according to WebMD. Soaking a boil repeatedly with a warm compress should bring its pus to the skin's surface, forcing it to burst and drain. Some boils may need to be lanced by a doctor.
Boils commonly appear on the face, neck, shoulders and buttocks, according to WebMD. Repeated touching and picking can lead to infection. Practicing good personal hygiene and carefully cleansing and treating minor skin wounds are ways to prevent boils from forming. The majority of boils disappear with simple home treatment. Signs of infection include fever, severe pain and the development of a second boil.