What is acne conglobata (AC)?

Updated: Apr 24, 2019
  • Author: Robert A Schwartz, MD, MPH; Chief Editor: Dirk M Elston, MD  more...
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Answer

Acne conglobata (AC) is an uncommon and unusually severe form of acne characterized by burrowing and interconnecting abscesses and irregular scars (both keloidal and atrophic), often producing pronounced disfigurement. The comedones often occur in a group of 2 or 3, and cysts contain foul-smelling seropurulent material that returns after drainage. The nodules are usually found on the chest, the shoulders, the back, the buttocks, the upper arms, the thighs, and the face. [1] Acne conglobata may develop as a result of a sudden deterioration of existing active papular or pustular acne, or it may occur as the recrudescence of acne that has been quiescent for many years. See the images below.

Nodules on the back. Courtesy of Emanuel G. Kuflik Nodules on the back. Courtesy of Emanuel G. Kuflik.
Nodules on the face. Courtesy of Emanuel G. Kuflik Nodules on the face. Courtesy of Emanuel G. Kuflik.
Nodules and pustules on the back. Courtesy of Eman Nodules and pustules on the back. Courtesy of Emanuel G. Kuflik.
A close-up view of nodules and pustules on the bac A close-up view of nodules and pustules on the back. Courtesy of Emanuel G. Kuflik.

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