A boil is a skin infection that originates on a hair follicle or an oil gland. The infected area turns red and a small bump develops on it shortly afterwards. In about 4 to 7 days, the bump turns white as pus begins to accumulate under the skin. Boils may appear anywhere on the human body, but the most common areas are on the face, arms, under armpits, neck, chest, back, shoulders, thighs, area around vAginA and buttocks. If a boil develops on the eyelid, it is known as a sty.
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