ABCDE-rule (formerly ABCD) for the macroscopic diagnostic differentiation of skin tumors (the clinical differentiation is done with the international TNM-classification!) via inspection.
A - Asymmetry
B - Borders
C - Color
D - Diameter (>5mm)
E - Evolution/Elevation
Overview
Overview with text
Overview with schematic
There is also an abcde-rule for the dermatoscopic diagnostic differentiation of skin tumors (the clinical differentiation is done with the international TNM-classification!).
(a)- asymmetry
(b) - border
(c) - coloration
(d) - differential structure
(e) - evaluation