A case is reported of deep cutancous mycosis in an immunosuppressed patient who, after heart transplantation, developed a solitary blue-black skin nodule that was excised. No cultures were taken. The nodule, in the dermis, was a granuloma with microabscesses containing a few pale yellowish-brown fungal spores that were found after much searching in hematoxylin- and eosinstained sectios. Stains for melanin showed numerous spores and septate branching hyphac that also stained with P.A.S. Mclanin staining indicated that the fungi were dematiaceous and that the lesion was a phaeomycotic cyst. Staining of stock cultures of fungi for melanin showed good correlation between the amount of pigment in cell walls of fungi and the accentuation of staining when a melanin stain was incorporated.
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