Criteria | Definition | Score* | |
Major criteria | Atypical pigment network | Prominent (hyperpigmented or thick) and irregular network. | 2 |
White-blue areas | Irregular, structureless white-blue area with an overlying "ground-glass" film. It cannot occupy the entire lesion. | 2 | |
Atypical vascular pattern | Linear irregular or dotted vessels, irregularly distributed outside areas of regression. | 2 | |
Minor criteria | Radial streaming (streaks) | Radial and asymmetric linear or bulbous projections at the edge of the lesion. | 1 |
Irregular blotches | Black, brown and/or gray structureless areas with irregular shape or distribution. | 1 | |
Irregular dots and globules | Black or brown round structures irregularly distributed. | 1 | |
Regression structures | White scar-like depigmentation and/or "peppering". | 1 |
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