Its purpose
The algorithm organises suspicious dermoscopic features in melanocytic lesions. It is used within clinical assessment; a score alone cannot confirm or exclude melanoma.
The seven classic criteria
- Atypical pigment network — 2 points.
- Blue-whitish veil — 2 points.
- Atypical vascular pattern — 2 points.
- Irregular streaks — 1 point.
- Irregular dots or globules — 1 point.
- Irregular blotches — 1 point.
- Regression structures — 1 point.
Scores and versions
The classic version uses a suspicion threshold of 3 points. Revised versions use different weightings; criteria and thresholds should not be mixed. Clinical interpretation and decisions about further investigation remain the professional’s responsibility.
For people checking their own skin
Do not calculate a score from phone photographs. Use the ABCDE guide as a reminder when checking your skin and report concerning changes or lesions to a doctor.
Sources and update
Editorial update: 16 October 2026. This information provides guidance and does not replace a medical assessment.