Hidradenitis suppurativa (HS) is recurrent inflammation of the apocrine sweat glands, particularly those of the axilla, genital, and perianal areas. It can result in obstruction and rupture of the duct and secondary infection. The lesions generally drain spontaneously, with formation of multiple sinus tracts and with hypertrophic scarring. Although not initially infected, the lesions frequently become secondarily infected. Often, patients with HS also are afflicted with acne, pilonidal cysts, and chronic scalp folliculitis; thus, giving rise to the term follicular occlusion tetrad.
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