SAMUEL AYRES JR., M.D., F.A.C.P.; NELSON PAUL ANDERSON, M.D.
The greatest problem in the conquest of eczema is the determination of the etiology in a given case. Attempts have been made to differentiate between those cases of eczema due to internal causes and those due to external irritants, the former being designated as eczema and the latter as dermatitis or dermatitis venenata. Such a distinction is often impossible on clinical grounds and should be made only in the presence of positive substantiating proof. The possible exception is a clean-cut case of dermatitis due to poison oak or poison ivy. Here the presence of the eruption in irregular blotches and
AYRES S, ANDERSON NP. The Patch Test in the Diagnosis of Contact Dermatitis1. Ann Intern Med. ;6:1161–1170. doi: 10.7326/0003-4819-6-9-1161
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Published: Ann Intern Med. 1933;6(9):1161-1170.
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