Criteria

International Contact Dermatitis Research Group guidelines - grading of patch testing[33]

  • +/- doubtful: faint erythema only

  • 1+ weak: erythema, papules

  • 2+ strong: vesicles, infiltration

  • 3+ extreme: bullous

  • IR irritant reaction: different types of reactions (soap effect, vesicles, blister, necrosis)

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