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Table 2 The ABCDE acronym

From: Clinical guidelines for the recognition of melanoma of the foot and nail unit

A Asymmetry. One half of the lesion is not identical to the other.
B Border. A lesion with an irregular, ragged or indistinct border.
C Lesion has more than one Colour present within it.
D Diameter. The lesion has a diameter of greater than 6 mm.
E Evolution. Any change in the lesion in terms of size, shape or colour.