TABLE 4.

Positive predictive values for melanocytic lesion according to feature

Feature	Absolute No	No with wrong diagnosis	Positive predictive value
Pigment network	380	69 (18.2%)	0.82
Aggregated globules	96	19 (19.8%)	0.80
Streaks	12	1 (8.3%)	0.92
Homogenous blue	8	1 (12.5%)	0.88
Parallel pattern	0	0 (0.0%)	—
None *	108	74 (68.5%)	0.32

^*“None” refers to the fact that, in the 2-step algorithm, all lesions without any non-melanocytic features are classified as melanocytic by default.