Abstract
Psoriasis of the mucous membrane is so rare that few dermatologists claim to have recognized it as such and probably many deny its existence. A routine examination that I made of many patients with psoriasis seen during a period of years showed no lesions of the mucosa even remotely resembling psoriasis except the case here reported. In the recent literature there have been reports of two cases—one by Jordan1 and the other by Keller.2 Jordan gives a complete review of the literature on the subject from 1860, which it will not be necessary to repeat here, except to state that in many of the earlier reports the lesion was most likely leukoplakia. He quotes Schultz (1898) as having seen three cases of psoriasis of the buccal mucosa associated with skin lesions in women and children (in whom leukoplakia is rare); also that Oppenheim and Thimm (1903) made the

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