Abstract
A group of mild affections of the skin of a transitory nature, characterized by a desquamation of the epidermis, was called pityriasis by Bateman. Biett gave a more definite meaning to pityriasis, which he considered a mild chronic inflammatory process of the most superficial layers of the derma, accompanied with continuous exfoliation of small epidermic scales. Devergie gave an interesting description of pityriasis, which he called rubra, and we can say that he established a new pathological entity. Pityriasis rubra (Devergie), however, has nothing to do with another disease of squamous nature, which was after a while described by F. and H. Hebra under the name of pityriasis rubra. F. Hebra1said that the name pityriasis rubra could be given to any disease of the skin which during its whole course was not accompanied by any other symptoms but a constant, intense, brownish-red discoloration, without marked infiltration, without formation of

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