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What is A child was brought to OPD with red follicular hyperkeratotic papules over knee.These are areas of normal skin in between.The child also has thickening of palms & soles.The most likely diagnosis is and explain in detail?
Red follicular hyperkeratotic lesions with "islands of sparing" and keratoderma(thickened palms & soles) points out to the diagnosis of Pityriasis rubra pilaris.