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A 1-year-old, entire male Tasmanian devil living in captivity was presented because of a nodular inguinal lesion that subsequently developed a draining sinus tract. A second, similar lesion developed later in the ipsilateral axillary region. A deep representative biopsy specimen of abnormal subcutaneous tissue showed chronic active pyogranulomatous inflammation and beaded Gram-positive and acid-fast bacilli situated in lipid vacuoles within the lesion. A rapidly growing Mycobacterium species, shown subsequently to be M. mageritense, was grown from a swab of the primary lesion. It was susceptible to tetracyclines (including doxycycline) and moxifloxacin in vitro. The lesions resolved following treatment with doxycycline monohydrate (50 mg PO once daily) and then moxifloxacin (10 mg/kg PO for 20 days). The infection probably resulted from inoculation of subcutaneous tissues by material containing this Mycobacterium following fight or bite injuries. The presentation is reminiscent of similar lesions attributable to rapidly growing mycobacterial infections of the subcutis observed in domestic cats and quolls.