Abstract
The older dermatologists classified diseases of the skin by their morphologic characteristics. This attitude is associated closely with such names as Hebra, Kaposi, Fox, Fordyce, Crocker and others. In modern dermatology, as in other special medical sciences today, effort must be made to establish, whenever possible, the etiology and pathogenesis of disease by histopathologic, bacteriologic and physicochemical methods. The group of diseases originally described by Kaposi under the name of sarcoid tumors is a striking example of diseases that previously were classified according to their morphologic characteristics, but more recently have been recognized as definite entities. Kaposi had in mind in his original description mycosis fungoides, lymphodermia perniciosa, sarcomatosis A, B and C and possibly leukemia cutis and pseudoleukemia cutis. Of the diseases classified by Kaposi1as sarcomatosis A, B and C, it is known that type A, melanotic sarcoma, is true blastoma. Type B, which Kaposi

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