Lupus Vulgaris: Can be endogenous & exogenous. Presents with n | Dermatology

Lupus Vulgaris: Can be endogenous & exogenous. Presents with non itchy annular plaque or long standing duration with atrophy. Apple jelly nodules are present in 10% of cases Scrofuloderma: Contagious spread of TB may be from underlying lymphnodes, fascia or bone. Most common site is cervical lymph nodes. Ulcer with bluish edges with undermined edges. After healing puckered scarring marks will develop. Lichen Scrufulosorum: Seen in children. Multiple grouped white papules all over the body, most commonly trunk. It is a source of TB lymphadenitis. Erythema nodosum: It is a panniculitis that presents as a painful red nodule on lower limbs. It is due to C1 deposition in vessels of subcutis. Causes: Idiopathic, Bacterial, fungal , viral infection, drugs (sulphonamides, contraceptives), IBD, Sarcoidosis, Behcet’s disease.