DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of a boil or furuncle on an infant's forearm. A boil is a painful skin infection, usually caused by the bacterium Staphylococcus aureus, which may enter through a hair follicle or a break in the skin. It starts as a red painful lump, which progressively fills with pus. Boils are treated with antibiotics or, in severe cases, may be lanced by a doctor to allow the pus to drain.
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