Granulomatosis with polyangiitis (GPA) is an uncommon necrotizing granulomatous vasculitis involving small and medium-sized vessels, most commonly affecting the skin, respiratory tract, and kidney.1 Rarely, GPA can present with necrotizing ulcers, making it difficult to discern GPA from other ulcerating skin disorders including pyoderma gangrenosum (PG) and other neutrophilic dermatoses.2 There is scant literature on a patient with simultaneous GPA and PG, acne, hidradenitis suppurativa (HS) (PAPASH, and psoriatic arthritis) presenting symptoms.
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Dejenie et al. (2024) studied this question.
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