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What is Which of the following is not a tuberculid and explain in detail?
Lichen nitidus (LIE-kun ni-TIE-dus) is a rare skin condition that usually appears as tiny, skin-colored, glistening bumps on the surface of your skin. Lichen nitidus results from abnormal inflammatory activity in skin cells, but the cause of inflammation is unknown Lichen scrofulosorum is a rare tuberculid that presents as a lichenoid eruption of minute papules in children and adolescents with tuberculosis. The lesions are usually asymptomatic, closely grouped, skin-colored to reddish-brown papules, often perifollicular and are mainly found on the abdomen, chest, back, and proximal pas of the limbs. The eruption is usually associated with a strongly positive tuberculin reaction.Of the three tuberculids, the incidence of lichen scrofulosorum was found to be the lowest (2%) in a large study conducted in Hong Kong. This highlights its rarity and significance as an impoant marker of undetected tuberculosis Papulonecrotic tuberculid is a chronic, recurrent, and symmetric eruption of necrotizing skin papules arising in crops, involving primarily the buttocks and extensor surfaces of the arms and legs. A hallmark of this condition is that lesions heal with varioliform and pitting scarring Ref Harrison20th edition pg 1267