IFNG and cutaneous tuberculosis: CTB: cutaneous tuberculosis, TBVC: tuberculosis verrucosa cutis, LS: lichen scrofulosorum, TG: tuberculous gumma, EI: erythema induratum, LV: lupus vulgaris, TST: tuberculin skin test, ATT: antitubercular therapy, HRZE: isoniazid, rifampicin, pyrazinamide, and ethambutol, IGRA: interferon gamma release assay.