What is the hallmark finding of hidradenitis suppurativa (HS)?

Updated: Nov 20, 2020
  • Author: Marina Jovanovic, MD, PhD; Chief Editor: William D James, MD  more...
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Multiple open comedones and so-called bridged comedones are the hallmark finding of hidradenitis suppurativa; they frequently progress to multiple abscesses and sinus tract formations. When 2 distant cutaneous orifices are interconnected through a subcutaneous fistula, they form bridging lesions. Adenopathy is rarely associated. With advanced disease, the destruction of most glands causes the apocrine glands to decrease in number or disappear. In the axillary region, 5- to 30-cm–long confluent infiltrations develop. These infiltrating lesions are firm and tend to merge at many points. As the disease becomes chronic, large scars and contractures develop with persistent erythema. The patient’s mobility is restricted, and the patient may not be able to fully raise his or her upper arm above the horizontal plane.

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