Table 6.

The ABCDE of nail melanoma after Levit [39]

A	Age Range 20-90, peak 5th -7th decades.
B	Band (nail band): Pigment (brown-black). Breadth > 3 mm. Border (irregular/blurred).
C	Change: rapid increase in size/growth rate of nail band. Lack of change: failure of nail dystrophy to improve despite adequate treatment.
D	Digit Involved: Thumb > hallux > index finger > single digit > multiple digits.
E	Extension: Extension of pigment to involve proximal or lateral nail fold (hutchinson's sign) or free edge of nail plate.
F	Family or personal history: Of previous melanoma or dysplastic nevus.