A Japanese patient with an eccrine poroma was presented. A rice-grain-sized brown pigment spot was on the top of the tumor. Microscopically melanin granules and melanocytes were found localized in a part of the superficial portion of the lesion. Previously reported cases of eccrine poroma have been reviewed especially for the microscopic findings of melanin, melanocytes, glycogen, intercellular bridges, and tonofibrils.
YASUDA T, KAWADA A, YOSHIDA K. Eccrine Poroma: A Japanese Case Showing Melanin Granules and Melanocytes in the Tumor. Arch Dermatol. 1964;90(4):428–431. doi:10.1001/archderm.1964.01600040056012
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