Acne keloidalis nuchae (AKN), also known as "acne keloidalis", "dermatitis papillaris capillitii", "folliculitis keloidalis", "folliculitis keloidis nuchae", and "nuchal keloid acne",[1]: 526  is a destructive scarring folliculitis that occurs almost exclusively on the occipital scalp of people of African descent, primarily men.

[2] AKN is characterized by firm pink, flesh-colored or hyperpigmented bumps in the skin, which are usually located on the back of the head or neck.

[3] The disease is closely related to pseudofolliculitis barbae and both occur frequently in black men in the military, where it is so common that the US Army has developed official protocols for management.

[4] Prolonged cases of AKN can cause keloid formation due to chronic irritation from folliculitis.

Treatments for AKN aim to reduce inflammation and prevent infections and scarring.