A 51-year-old woman with an orthotopic liver transplant on tacrolimus (SKF
506) and prednisone presented with an erythematous ulcerated nodule on the
knee. No preceding trauma was noted. A skin biopsy specimen demonstrated be
aded gram-positive, acid-fast rods and the skin culture grew Mycobacterium
chelonae (formerly M chelonae subsp chelonae). This report describes the fi
rst case in a liver transplant patient of cutaneous Mycobacterium chelonae
under the current method of designating atypical Mycobacterium species.