Acne keloidalis nuchae (AKN) also known as  Acne keloidalis, Dermatitis papillaris capillitii, Folliculitis keloidalis, Folliculitis keloidis nuchae and  Nuchal keloid acne is a scalp condition that commonly affects the back of the scalp. Patients develop what they frequently term 'bumps' at the back of the scalp. These frequently are associated with hair loss and the bumps themselves may stay and enlarge. In advanced cases the areas coalesce to form a large plaque.  

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