Tuberculosis of the skin is not exceptional in Africa South of the Sahara. The different ways of contamination of the skin by the tubercular bacillus and the level of immunologic reaction of the host account for the clinical polymorphisms. The bacillus is detected with difficulty, and the classical anatomo-pathological feature of tuberculoid granuloma is rarely complete: A classification based on physiopathological, clinical, bacteriological and histological criteria is an help to diagnosis.
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