Dysplasia is an important term in pathology reports. Dysplastic melanocytes look abnormal in some way.
The cells may have a nucleus that’s abnormal in shape and colour. The nuclei may be angulated, a darker colour (hyperchromasia), or it may nucleoli may be prominent. There may also be bridges between epidermal projections, which are finger-like projections into the epidermis from the layer below, or even some fibrosis (scar-like tissue).
If the pathologist can’t tell a lesion from a melanoma, then it’s called a severely dysplastic nevus.