Cutaneous Mycobacterium haemophilum infection in iatrogenically immunocompromised patients without transplantation.

Cutaneous Mycobacterium haemophilum infections are most often the result of HIV or transplantation-associated immunosuppression. Rarely, M. haemophilum may infect healthy patients or iatrogenically immunosuppressed patients without transplantation. We herein report two cases of cutaneous M. haemophilum infection in HIV-negative patients without transplantation undergoing iatrogenic immunosuppression. Our cases and a literature review highlight the various clinical contexts in which M. haemophilum may arise in this patient population. Accordingly, we emphasize that a high index of suspicion is needed for diagnosis, which ultimately relies on skin biopsy, histopathologic examination, and culture.