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ABCD Rule
| Diagnostic Criteriaa | Score | Weight Factor |
|---|---|---|
| Asymmetry | 0–2 | x 1.3 |
| Border pigment pattern | 0–8 | x 0.1 |
| Color variation | 1–6 | x 0.5 |
| Different structural components | 1–5 | x 0.5 |
Total dermoscopic score ≥ 5.45 is highly suggestive of melanoma; Total dermoscopic score = 1.3 (A score) + 0.1 (B score) + 0.5 (C score) + 0.5 (D score).
