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A case of black dot ringworm caused by Trichophyton rubrum was reported. A 49-year-old woman visited our office complaining of her scaly erythematous eruptions of one year duration on her almost whole body. She was treated successfully by anti-fungal agents under diagnosis of tinea corporis, however, the rash relapsed eleven months later. In addition to the widespread lesions of tines corporis, nemerous black dots were seen on the parietooccipital area of the head. Light microscopic examination of the infected hairs showed large spores of the endothrix type. Wood's lamp examination was negative. Nails were also thickened and brittle. Physical examination revealed that she suffered from Cushing's syndrome. In macroscopic appearance, the center of thalli was heaped up and red pigment was beneath the thalli. Microscopically, longstrands of hyphae with tearshaped microaleuriospores and a small number of cylindrical form macroaleuriospores were observed. The production of red pigment on corn meal dextrose agar was also confirmed. Although the report of black dot ringworm was increased in Japan, only three cases out of 63 were caused by Trichophyton rubrum.
日本医真菌学会の論文