Mycobacterium haemophilum: Cutanoeus nodules in a renal transplant patient.

A 52-year-old male with a history of renal transplantation and chronic iatrogenic immunosuppression presented with a several-week history of hyperpigmented cutaneous nodules on bilateral upper and lower extremities. Biopsy showed inflammatory granulomatous dermatitis caused by acid-fast bacilli (AFB). However, tissue cultures for mycobacterium were repeatedly negative. The patient was diagnosed with Mycobacterium haemophilum based on PCR results and was placed on empiric antibiotic therapy.