Abstract
BACKGROUND: Tuberculides are characterised by delayed-type of immunologic reactions to Mycobacterium tuberculosis or its products in immuno-competent individuals. We herein describe clinico-epidemiological features and response to treatment in patients with tuberculides from a tertiary care centre from North India. METHODS: This was a retrospective analysis of the clinical records of all the cutaneous tuberculosis (TB) patients (year 2000-2019) enrolled in the TB clinic. The patient records fulfilling the diagnostic criteria of tuberculides were considered for analysis. RESULTS: A total of 225 patients attended the tuberculosis clinic; out of this, 34 were diagnosed as tuberculides. Out of these 34 cases, 21 were identified as LS, 2 erythema induratum of Bazin, 1 papulonecrotic tuberculide, and 10 erythema nodosum. History of contact to open cases of TB was present in 15/34 (44.1%) patients. History of BCG vaccination was found in 15/34 (44.1%) patients. The focus of underlying TB could be identified in 20/34 (58.8%) patients. Skin biopsy was performed in all patients. In all patients, the diagnosis was confirmed by clinico-pathological correlation, positive TST, and the underlying focus of TB. All patients received 6 months regimen of anti-tubercular therapy with first-line drugs. CONCLUSION: In this study, we demonstrated various forms of tuberculides; lichen scrofulosorum was the most common form. We also included erythema nodosum cases also, which responded well to ATT. Observation from our study showed that tuberculides are important cutaneous markers for underlying tuberculosis infection, which helps in early detection of occult tuberculosis and timely management.