Erythema induratum of Bazin induced by tuberculin skin test

Mycobacterium tuberculosis found at both skin lesions and Mantoux testing site in a patient with erythema induratum of Bazin

“…To our knowledge, there is no previous report about the positive findings of M. tuberculosis at the location of Mantoux testing 3. It is negative in other patients receiving Mantoux test in our ordinary clinical practice, according to our serial observations.…”

“…The pathogenesis of EIB remains poorly understood and its relation to tuberculosis is still controversial. Most authors currently consider EIB a multifactorial disorder with many different causes, tuberculosis being one of them, which was thought to be a hypersensitive immune response to M. tuberculosis 2, 3. Multidrug antituberculosis therapy is helpful in the latter situation 4…”