A boil is an abscess, or a collection of pus, that forms within the skin. There are different types of boils. Boils can develop anywhere on the body, including the trunk, extremities, buttocks, groin, armpit, or other areas. Boils often occur at the site of hair follicles.
Signs and symptoms of a boil include a painful, red bump that starts out small and can enlarge to more than 2 inches (5 centimeters) and swollen skin around the bump. There is typically an increase in the size of the bump over a few days as it fills with pus, leading to development of a yellow-white tip that eventually ruptures and allows the pus to drain out.
Cause of a boil
Bacterial infections cause boils.
Other boil symptoms and signs
- Bump Increases in Size Over a Few Days
- Drainage of Pus
- Painful, Red Bump on the Skin
- Swollen Skin Around the Bump
- Yellow-White Tip on the Bump
Main Article on Boil Symptoms and Signs
Pictures, Images, Illustrations & Quizzes
Boils: Pictures, Causes, Symptoms and Treatment
When are boils (carbuncles, a cluster of connected boils) dangerous? How many days do boils last? Can a boil go away on its own?...
Picture of Boil
A boil, also referred to as a skin abscess, is a localized infection deep in the skin. See a picture of a Boil and learn more...