Abstract
Lichen scrofulosorum (LS) and papulonecrotic tuberculids are unique reaction patterns – tuberculids – of the skin caused by hematogenous dissemination of the mycobacterium in those individuals possessing a high/moderately high immunity. Consequently, the bacilli are speedily destroyed in the skin, and are hard to demonstrate by smear. Accordingly, the presence of a perceptible active or concealed, systemic and/or cutaneous focus of tuberculosis is the vital prerequisite for a tuberculid. More often than not a strongly positive tuberculin reaction is indicative of tuberculids. Its histogenesis is enigmatic. However, type IV hypersensitivity reaction incited by chronic tuberculous focus may be plausible. 1,2
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