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| Fig. 30.3 Tuberculosis cutis orificialis. Erythematous eroded plaque of perianal area. (Courtesy of James E. Fitzpatrick, MD.) |
Tuberculosis of the skin can be divided into two categories: true cutaneous tuberculosis infections and tuberculid reactions. True cutaneous tuberculosis includes lupus vulgaris, tuberculosis verrucosa cutis, cutaneous miliary tuberculosis, cutaneous primary tuberculosis, and tuberculosis cutis orificialis (Fig. 30-3). A tuberculid refers to a cutaneous or mucosal lesion that represents an immunologic response to a previous infection of tuberculosis at a remote site. Special stains and culture of a tuberculid lesion are negative. Tuberculid reactions include lichen scrofulosorum, papulonecrotic tuberculid, and erythema induratum.
