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Ulceration in an area of necrobiosis lipoidica diabeticorum is a frequent complication but malignant transformation is rare. One such case is reported in a diabetic patient and the literature is reviewed.

Ulceration in an area of necrobiosis lipoidica diabeticorum is a frequent complication but malignant transformation is rare. One such case is reported in a diabetic patient and the literature is reviewed.

Pyoderma gangrenosum (PG) is an idiopathic necrotising cutaneous disorder. It is associated with systemic diseases like inflammatory bowel disease, monoclonal gammopathy, arthritides and haematological malignancy. PG occurring at sites of trauma, a phenomenon called pathergy, is well described. One of the manifestations of pathergy is PG occurring at sites of surgery. We describe a case of PG at sites of reduction mammaplasty and review the literature so far.

Sarcoidosis has long been associated with mycobacterial infection, especially with Mycobacterium tuberculosis, although a causal association has not been proven. Atypical mycobacteria have also been implicated in causing sarcoidosis, but there is as yet no conclusive evidence. We report the activation of cutaneous sarcoidosis following infection with M. marinum, raising further questions about the role of these bacteria in causing this chronic granulomatous disorder.