Maximum malignant potential is seen in
Epidermal nevus
Junctional nevus
Dermal nevus
Blue nevus
The diagnosis can be made by visual inspection alone. Although most cases of blue nevi are benign, there is a small possibility that a cellular blue nevus can undergo malignant transformation and become a malignant cellular blue nevus (MCBN). Thus, a biopsy of any changing or suspicious lesion should be done Ref Harrison20th edition pg 1456
Skin tumors