Table 1.

Definition of the observed dermoscopic features.

Dermoscopic feature	Definition
Vessels type	Identification of a vascular component and classification into one of the following morphologic categories: linear, comma, hairpin, polymorphic, dotted, coiled, and arborizing.
Vessels distribution	Central, peripheral, diffuse, irregular.
Streaks	Brownish-black linear structures of variable thickness, not clearly combined with pigment network lines. Scored as regular (regularly distibuted at the periphery of the lesion), or irregular.
Homogeneous pigmentation	Areas of structureless color varying from black, brown, blue, pink, and red.
Superficial black network	Distinctive type of pigment network, visible on the suface of heavily pigmented lesions.
Brown globules	Regular: sharply circumscribed, usually round to oval, black to brown structures. Irregular: variously sized and colored globules irregularly distributed within the lesion.
White lines	White crossing lines in between the vascular structures or the pigmented globules and/or white parallel or orthogonal and disordered linear streaks or short lines.
Network	Regular: light- to dark-brown pigmented, regularly meshed and narrowly spaced network distributed more or less regularly throughout the lesion. Irregular: black, brown, or gray, irregularly meshed network, distributed more or less irregularly throughout the lesion and usually ending abruptly at the periphery.
Blue white veil	Confluent, gray-blue to whitish-blue, diffuse pigmentation.
Regression	Grey-blue areas, white areas, peppering.