The purpose of this paper is to describe a phenomenon1 in which the site of a positive reaction to a patch test becomes reddened again after having returned to normal. The second appearance of redness occurs without local contact but simultaneously with a new contact causing dermatitis elsewhere. No doubt this phenomenon has been observed before, but I have not seen it described.
REPORT OF CASES
Mrs. F. had been complaining of sore hands for four months when I first saw her. The history of her cutaneous disorder showed that during the previous year she had been unable to wear a white gold wrist watch and white gold earrings because of local irritation produced by them.Clinical examination revealed definite areas of erythematosquamous eruption, together with patches of vesiculation and crusting, on the backs of the hands and around the wrists.Patch tests carried out immediately
Counter CE. RECURRENT REACTION TO PATCH TEST. Arch Derm Syphilol. 1938;37(3):495–496. doi:10.1001/archderm.1938.01480090124011
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