Pyoderma gangrenosum (PG) is an inflammatory, noninfectious neutrophilic dermatosis that presents as painful nodules or pustules that rupture and form a necrotic ulcer with an irregular undermined violaceous border. The full list of differential diagnoses must be considered and excluded by clinicians before diagnosing PG to avoid erroneous treatments with systemic corticosteroids or other immunosuppressants.1 We report the case of a patient who presented with lesions that were identical to those found in PG but that occurred secondary to cutaneous diphtheria (CD).
Morgado-Carrasco D, Riquelme-Mc Loughlin C, Fustá-Novell X, Fernández-Pittol MJ, Bosch J, Mascaró JM. Cutaneous Diphtheria Mimicking Pyoderma Gangrenosum. JAMA Dermatol. Published online December 27, 2017. doi:10.1001/jamadermatol.2017.4786