“…There is mild acanthosis. The granular layer in the depression may be increased in thick ness [Buchanan, 1963;Coupe and Usher, 1963], normal [Galloway and Adamson, 1918;Sweitzer, 1923] or absent [Brown, 1971;Michael, 1933], When it is absent, the overlying horny layer is usually parakeratotic. Occasionally, an extension of a sweat duct in the underlying dermis is seen travers ing the horny layer [Brown, 1971;Coupe and Usher, 1963;Galloway and Adamson, 1918;Sweitzer, 1923], The dermal papillae are usually normal but may be edematous with dilatation of subjacent small vascular channels [Buchanan, 1963;Coupe and Ush er, 1963], These histologic features are also shared by disseminate PPK [Michael, 1933].…”