To improve diagnostic accuracy the ABCD rule of lesion screening
is widely used based on asymmetry (A), border (B), color (C),
and differential structure (D) measuring. • A total
dermatoscopic value (TDV) results from the calculation TDV =
A·1,3 + B·0,1 + C·0,5 + D·0,5 • This score contributes to the
differentiation between benign and malignant lesions: 1,00 -
4,75 – benign skin lesion 4,75 - 5,45 – suspicious More than
5,45 – melanoma A – Asymmetry of Shape, Structure and Color. The
lesion is divided in four regions and there is symmetry
inspected across x or y axis. If asymmetry is only by one axis
it gives 1 point and if on both axis there are 2 points
calculated. So for shape, structure and color, there can be 6
points maximum. Border and Color For measuring border
irregularities the lesion is divided in 8 regions. If in one
particular region color is ends strictly with boundary of lesion
there is one point. If lesion color changes smoothly to skin
color then there is 0 points. So for B there can be maxim