[Acne inversa/hidradenitis suppurativa: An update].

Acne inversa (AI)/hidradenitis suppurativa is a chronic, recurrent, immune-mediated dermatosis characterized by deep inflammatory nodules, abscesses, fistulas, and undermined scars in skin areas bearing apocrine glands. In addition to the cutaneous manifestation, numerous AI patients show metabolic changes, spondyloarthritis, and depression. AI leads to a strong reduction in the quality of life and an impairment of the sexual life of affected individuals and often culminates in social withdrawal, stigmatization, unemployment, and suicidal thoughts. In this overview, we summarized the most important facts about AI and propose a simple algorithm for therapy.