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Background   Mycobacterium ulcerans  causes necrotising infections of skin and soft tissue mediated by the polyketide exotoxin mycolactone that causes cell apoptosis and immune suppression. It has been postulated that infection can be eradicated before the development of clinical lesions but spontaneous resolution of clinical lesions has been rarely described.    Methodology/Principal findings  We report a case series of five Australian patients who achieved healing of small  M .  ulcerans  lesions without antibiotics or surgery. The median age of patients was 47 years (IQR 30–68 years) and all patients had small ulcerative lesions (median size 144mm 2 , IQR 121-324mm 2 ). The median duration of symptoms prior to diagnosis was 90 days (IQR 90–100 days) and the median time to heal from diagnosis without treatment was 68 days (IQR 63–105 days). No patients recurred after a median follow-up of 16.6 months (IQR 16.6–17.9 months) from the development of symptoms and no patients suffered long-term disability from the disease.    Conclusions  We have shown that healing without specific treatment can occur for small ulcerated  M .  ulcerans  lesions suggesting that in selected cases a robust immune response alone can cure lesions. Further research is required to determine what lesion and host factors are associated with spontaneous healing, and whether observation alone is an effective and safe form of management for selected small  M .  ulcerans  lesions.

Spontaneous healing of Mycobacterium ulcerans disease in Australian patients