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To the Editor:—
In the article on "The Phenomenon of 'Black Dermographism' " by Urbach and Pillsbury (The Journal, February 13, p. 485) the authors state that the phenomenon was first reported by Emdin and Kusmenko in 1925; but in the discussion Anderson and Becket cited studies made on this subject sixty years ago.The following references may also be of interest: In 1902 Solomon Solis-Cohen (A Further Contribution to the Subject of Vasomotor Ataxia, Tr. Assn. Am. Physicians17:644, 1902) stated: "In certain patients, especially those with more or less constant red flushing of the face, if a silver probe be drawn across the flushed cheek a bluish black mark will be left, which can afterward be wiped off. I assume that this is due to the formation of silver sulphide, but I have not as yet been able to have a chemical study made."Ten years later he
Solis-Cohen M. "THE PHENOMENON OF BLACK DERMOGRAPHISM". JAMA. 1943;122(15):1034. doi:10.1001/jama.1943.02840320052022
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