The authors report a case of lupus vulgaris in a 22-year-old female patient occurring three months after BCG vaccination, with a period of evolution of two months. The Mantoux intradermoreaction (1 U) was strongly positive, and no acid-fast bacilli were found in the lesion, either by direct analysis or by culture in a Lowenstein medium. The histopathological findings confirmed the diagnosis. Prescribed treatment with isoniazid and rifampicin for three months resulted in complete healing on the sixth month.