Psoriasis

Biopsy of a Psoriasis vulgaris on the stretching side of the elbow: certain features typical of psoriasis allow a specific diagnosis (micro-abscesses piled up on top of one another in the horn skin layer, narrow supra-papillary epidermis); however, the usual appearance of psoriasis is greatly altered by the physical stresses brought about through the location (compact horny skin layer, hypergranulosis instead of narrowed granular-cell layer, irregular epithelium hyperplasia instead of an even, extended ridge network).

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