Table 3.

Differences in the classification approaches between the methods adopted in [13] and in this work.

Classification	Approach Followed in [13]	Approach Followed in This Work
Number of classes defined in the same image	>2	2 (C1: regular clusters; C2: possible irregular clusters)
Identification of sure clusters with specified characteristics	Yes	No (the attention is focused on “possible” and uncertain clusters identifying the risk of naevoid melanoma)
Number of images adopted in the entire classification	125 (images with melanoma)	18 (pre-screening images)