Co‐existence of atypical tuberculid with lupus vulgaris

Abstract

Cutaneous tuberculosis (CTB) is an uncommon form of extra-pulmonary tuberculosisaccounting for ≤2% of mycobacterium tuberculosis cases and is more often reported from developing countries. Tuberculid, a cutaneous hypersensitivity reaction to mycobacteria or its fragments, is a another rare cutaneous manifestation seen in association with tuberculosis of other organ systems including tuberculous lymphadenitis, pulmonary tuberculosis, etc. Co-occurrence of a tuberculid with CTB is extremely rare.Herein we report a childhood case of lupus vulgaris, a type of CTB, associated with an atypical presentation of tuberculid.atypical tuberculid, cutaneous tuberculosis, lupus vulgaris | INTRODUCTIONMycobacterial tuberculosis (TB) remains a significant challenge, disproportionately affecting developing countries and underserved communities. Cutaneous TB (CTB) is rare, accounting for a 0.5%-2% of extra-pulmonary TB. 1 The prevalence of CTB among children in different studies has been reported to range from 19% to 55%. [1][2][3][4][5] Lupus vulgaris (LV), a slowly progressive form of paucibacillary CTB in patients with moderate immunity, accounts for 21% to 63% of the pediatric CTB cases. [1][2][3][4][5] The lesions manifest as slowly progressive, erythematous to brownish papules, nodules, and plaques with active periphery and central atrophy and scarring. Tuberculids are delayed