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October 1972

Histological Variations in Lesions of Psoriasis

Author Affiliations

Stanford, Calif

From the Department of Dermatology, Stanford University School of Medicine, Stanford, Calif.

Arch Dermatol. 1972;106(4):503-506. doi:10.1001/archderm.1972.01620130035008

Many clinically characteristic psoriatic plaques present histological evidence of relatively low mitotic activity. The mitotic index in individual lesions is related to the amount of parakeratosis at the base of the stratum corneum. Alternating layers of corneal orthokeratosis and parakeratosis, frequent in psoriasis, suggest that epidermal growth activity fluctuates in the lesions even without treatment. This indicates that a control mechanism operates to a variable degree in psoriatic lesions. It is suggested that this represents a mechanism which, when better understood, might be utilized in treatment or prevention of the disease.