Folliculitis - Definition

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The pilosebaceous follicle is the bag from which hair grows. Folliculitis is the inflammation of the follicle and can be caused by a bacterium, virus, or fungus. In general, inflammation is a side-effect of an infection caused by a bacterium, Staphylococcus aureus: this is called a boil. The boil appears as a small hard area at the base of the hair, which is painful, but will necrotize (cell death) after a few days, and leave a sort of reddish hollow behind. Boils are localized mostly on the thighs, back, or shoulders. In the case of folliculitis, it is advisable not to touch the lesions in order to prevent spreading them. Good hand hygiene with an antiseptic soap is generally sufficient.