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Assessment of patch test reactions
| Grading | Description of response |
|---|---|
|
| |
| 0 | No reaction |
| + | Weakly positive reaction (usually characterized by mild erythema or dryness across most of the treatment site) |
| ++ | Moderately positive reaction (usually distinct erythema possibly spreading beyond the treatment site) |
| +++ | Strongly positive reaction (strong, often spreading erythema with edema) |
