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International Contact Dermatitis Research Group patch test scaling recommendations
| Symbol | Morphology | Interpretation |
|---|---|---|
| - | No reaction | Negative |
| ?+ | Non-palpable, faint erythema | Doubtful reaction |
| 1+ | Erythema, infiltration, possibly discrete papules | Weak positive |
| 2+ | Erythema, infiltration, papules, vesicles | Strong positive |
| 3+ | Erythema, infiltration, confluent vesicles | Extreme positive |
| ir | Different types of reactions (blisters, soap effect) | Irritant reaction |
