A hair bump cyst is a small, noncancerous growth that forms on the scalp. It is usually filled with keratin, a protein that is also found in hair and nails. Hair bump cysts are common and can affect people of all ages. They are not typically painful, but they can be unsightly.
Hair bump cysts are caused by a blockage in the hair follicle. This blockage can be caused by a number of factors, including genetics, hormones, and certain medications. Hair bump cysts are not contagious and they do not spread from person to person.
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