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Hidradenitis is a chronic, pus-producing and scarring disease process that occurs due to obstruction of hair follicles and secondary infection and inflammation of certain sweat glands. This condition is found under the arms or within the anal region. It is characterized by the development of recurrent, boil-like nodular lesions and deep pus-containing pockets of infection (abscesses) that may eventually rupture through the skin. Healing of affected areas is typically associated with progressive scarring (fibrosis). The specific underlying cause of hidradenitis is unknown.