Case report: cutaneous nontuberculous mycobacterial abscesses associated with insulin injections.

Nontuberculous mycobacterial (NTM) infections are on the rise and often cause skin diseases that are misdiagnosed. The authors present three cases of atypical mycobacterial infections in insulin-dependent diabetics occurring in sites of subcutaneous insulin injections. One of the patients was vitamin D deficient at the time of infection with NTM. The history and clinical presentation of the cases are presented; pathogenesis and treatment are discussed in conjunction with the correlation of mycobacterial disease susceptibility with vitamin D deficiency.