Table 1: Eleven variables of regression and their definitions.

Parameter Definition (1) Regression Presence of grey-blue areas and/or peppering and/or blue-whitish veil and/or white areas (2) Grey-blue areas Bluish and/or larger areas of grey-blue pigmentation  (a) Structureless Grey-blue homogeneous pigmentation  (b) Reticular Coarse blue-grey net, with thick grey-blue lines and large holes  (c) Globular Aggregated grey-blue globules (3) Peppering Blue, fine pepper-like structures (4) White areas White scar-like areas (5) Blue-whitish veil Compact, structureless, irregular, and confluent blue-whitish pigmentation. Similar to a superficial veil, palpable over the lesion (6) Pink areas Areas of the lesion lighter than the surrounding skin with a pinkish shade (7) Light brown areas Light brown structureless irregular areas (8) Regression of dermoscopic structures Fading of net, globules, or pigmentation giving rise to light brown areas or small structureless areas within a structured area