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Score—Interpretation of patch testing reactions.
| Score | Interpretation |
|---|---|
| − | Negative reaction |
| ? or +/− | Doubtful reaction, faint erythema |
| + | Weak reaction, erythema, slight infiltration |
| ++ | Strong reaction, erythema, infiltration, papules or vesicles (bullae) |
| Reaction may extend beyond the margins of the patch | |
| +++ | Extreme, bullous, ulcerative |
| IR | Irritant reaction: Follicular, pustular, bullous or necrotic |
| NT | Not tested |
