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Hair follicle - Definition


Definition


The hair follicle, or pilosebaceous follicle, is the cavity where hair grows from. In humans, there are hair follicles on the entire surface of the body except the palms of the hands and soles of the feet. The hair follicle also contains a gland at its upper part, the sebaceous gland, which produces sebum for lubrication purposes. The hair is built through the process of keratinization, meaning the assembly of keratin cells. In some cases, the pilosebaceous follicle may be the site of inflammation: this is called folliculitis, and if the infection is deeper and caused by a bacterium, Staphylococcus aureus, it is called a boil.
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