Mycobacterial infections of the skin of two patients are presented, one caused by a group II scotochromogen and the other caused by Mycobacterium marinum (balnei). The scotochromogen infection is the second reported case of skin infection due to that organism. Both infections were contracted after injury in brackish or salt water.
Mycobacteria produce pulmonary disease, adenitis, osteomyelitis, and skin infections. The causative organism may be identified by optimum growth temperature, pigment production, animal pathogenicity, and serologic studies. Some difficulties were encountered in identifying M marinum (balnei).
The decision to use antimicrobial therapy, local therapy, or no treatment rests on knowledge of the organism and the clinical condition of the patient. Local therapy was used in one patient without success, and both were given antimicrobial therapy.
Robert E. Cott, D. Martin Carter, Theodore Sall. Cutaneous Disease Caused by Atypical MycobacteriaReport of Two Chromogen Infections and Review of the Subject. Arch Dermatol. 1967;95(3):259–268. doi:10.1001/archderm.1967.01600330017004