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Pale-cell acanthoma and a plaque of psoriasis have numerous attributes histopathologic in common. Both are characterized by elongated epidermal rete ridges and correspondingly elongated dermal papillae. The long papillae house dilated, tortuous capillary that spirals upward to very near thinned suprapapillary plates. A superficial perivascular infiltrate of inflammatory cells is present and varies in density. […]