A granulomatous reaction developed in the red part of a professionally executed tattoo. The reaction appeared a few weeks after tattooing. A patch test for mercuric bichloride proved negative. The localization to the red part of the tattoo implies a specific reaction to an unknown antigen, and that the reaction may denote a localized delayed hypersensitivity.
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Jesper Verdich (1981) studied this question.
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