Psoriasis
	Sharply demarcated erythematous papules and plaques covered by scale, which may be silvery Lesions classically involve the scalp, elbows, and knees. The intergluteal cleft is another common site; 50% of patients have nail involvement. Occasionally psoriasis may cover the entire skin surface. Increased epidermal proliferation results in accumulation of stratum corneum (scale)
	Histology: Hyperkeratosis, acanthosis, dilated tortuous vessels in the papillary dermis See laboratory section for additional examples of histology

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