| | S. N | Classification of cutaneous tuberculosis | Diagnostic considerations |
| | 1 | Exogenous cutaneous Tuberculosis | Tuberculosis chancre | sporotrichosis, leishmaniasis, atypical mycobacteriosis, syphilis, cat scratch disease and tularemia | | Tuberculosis verrucosa cutis | paracoccidioidomycosis, leishmaniasis, sporotrichosis, tuberculosis verrucosa and chromomycosis. Lobomycosis, atypical mycobacteriosis, hypertrophic lichen planus, verrucous carcinoma, iododerma, bromoderma, verruca vulgaris, keratoacanthoma centrifugum and pyoderma vegetans |
| | 2 | Endogenous cutaneous tuberculosis | Scrofuloderma | tertiary syphilis, paracoccidioidomycosis, actinomycoses, lymphogranuloma venereum, bacterial abscesses, tumor metastasis, histiocytosis and hidradenitis | | Orificial tuberculosis | bullous diseases, trauma, fungal diseases, syphilis, sarcoidosis, or squamous cell carcinoma | | Lupus vulgaris | basal cell carcinoma, sarcoidosis, discoid lupus erythematosus, Leprosy, Deep Fungal infections | | Tuberculous gumma | leishmania, sporotrichosis, nocardiosis, atypical mycobacteria (Mycobacterium marinum), pyogenic infections (Staphylococcus aureus, Streptococcus), and deep fungal infections | | Acute miliary tuberculosis | metastatic carcinomas |
| | 3 | Tuberculids | Papulonecrotic tuberculid | pityriasis lichenoides et varioliformis acuta (PLEVA), leukocytoclastic necrotizing vasculitis, pruritus and secondary syphilis | | Lichen scrofulosorum | lichen planus and lichen nitidus, syphilid lichenoides, eczematid, keratosis pilaris, pityriasis rubra pilaris (PRP) and micropapular sarcoidosis | | Erythema induratum of Bazin | erythema nodosum, cutaneous polyarteritis, pancreatic panniculitis, lupus profundus, subcutaneous sarcoidosis and cutaneous T-cell lymphoma |
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