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Table 1 Criteria for human skin patch test by International Contact Dermatitis Research Group

From: The effect of three-dimensional cultured adipose tissue-derived mesenchymal stem cell–conditioned medium and the antiaging effect of cosmetic products containing the medium

±0.5Doubtful or slight reaction and erythema
+1Erythema + Induration
++2Erythema + Induration + Vesicle
+++3Erythema + Induration + Bullae