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What is Mycobacterium causing skin ulcer – a) M. smegmatisb) M. scrofulaceumc) M. ulceransd) M. fortuitume) M. marinum and explain in detail?
Mycobacteria causing skin infections

Post-trauma abscess → M.chelonae, M.fortuitum, M.terrae
Swimming pool granuloma → M.marinum(M. Balanei)
Buruli ulcer → M.ulcerans
Lupus vulgaris → M.tuberculosis
Scrofuloderma → M.tuberculosis 
Abscess and granuloma may break to fonn an ulcer.
So, all the organism in above list can cause skin ulcer.