Abstract
One occasionally encounters cases of dermatitis with such a definite etiologic relation to lesions of the peripheral nerves that this association can scarcely be considered coincidental. Such a condition was recently observed in the Mayo Clinic. REPORT OF A CASE A woman, aged 47, was seen on Aug. 3, 1921, with a distinct erythema and a papulo-vesiculo-pustular eruption on the right side of the face. There was considerable scaling, oozing and crusting. At no time during observation was an herpetic aspect apparent. There was seborrheic dermatitis of the scalp. The past history revealed that the patient had been suffering from trigeminal neuralgia of the left side since 1907, and of the right side also since 1912. Numerous injections had been made into the nerves of both sides with osmic acid and alcohol. On Dec. 11, 1920, the posterior root of the right trigeminal nerve had been sectioned, and three weeks

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