Hair follicle inflammation, illustration. Hair follicles are the structures from which hair grows in the skin. They are lubricated by sebum (yellow), an oily material secreted by the skin's sebaceous glands. These glands and the follicle can become inflamed due to irritation or infection. Skin cells are shown here within the epidermis, as well as the blood vessels (red and blue) in the dermis layer of the skin.
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