Q&A: What Causes Boils?

boil under skinQ: What causes boils? I have them on my thighs. – J. P.

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A: A boil is a skin infection that starts in a hair follicle or oil gland. At first, the skin turns red in the area of the infection, and a tender lump develops. After four to seven days, the lump starts turning white as pus collects under the skin.