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The ABCDEF rule in LM
| The ABCDEF rule in LM |
|---|
| A (age, Afro-Americans, native Americans, and Asians): 5th and 7th decades |
| B (nail band): brown to black colour, ≥3 mm wide, irregular borders |
| C (change): rapid ↑ in size of band and/or change in morphology |
| D (digit involved): thumb > hallux > index finger, dominant hand, single digit |
| E (extension): Hutchinson’s sign |
| F (family): Personal or familial history of nevi dysplastic syndrome and melanoma. |
