Hidradenitis suppurativa
（重定向自Hydradenitis suppurativa）
Hidradenitis suppurativa (HS), or as it is also known Acne Inversa, is a rarely diagnosed chronic skin disease characterized by clusters of abscesses or subcutaneous boil-like "infections" (oftentimes free of actual bacteria) that most commonly affects apocrine sweat gland bearing areas, such as the underarms, under the breasts, inner thighs, groin and buttocks. The disease is not contagious. There are indications that it is hereditary among certain ethnic groups and autoimmune in nature. Onset is most common in the late teens and early 20's.