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Lupus vulgaris is the most common form of cutaneous tuberculosis. It may easily be overlooked if a proper differential diagnosis is omitted.    Case presentation  A 46-year-old Turkish woman presented with a 42-year history of erythamatous plaque on her left arm. Ziehl–Neelsen and periodic acid-Schiff stains did not show any acid-fast bacilli. Culture from a biopsy specimen was negative for  Mycobacterium tuberculosis . The result of a polymerase chain reaction-based assay for  Mycobacterium  was negative. Histopathologic findings revealed a tuberculoid granuloma containing epithelioid cells, lymphocytes and Langerhans-type giant cells. A diagnosis of lupus vulgaris was made by clinical and histopathologic findings.    Conclusions  The lesion improved after antituberculous therapy, confirming the diagnosis of lupus vulgaris.

Lupus vulgaris mimicking hemangioma diagnosed 42 years after onset: a case report