These two melanoma subtypes differ with regard to their age of onset, associated patterns of exposure to UV radiation, association with precursor lesions, clinical and histopathological...

Experts group skin cancers into two broad categories: melanoma and nonmelanoma. Melanoma occurs when cancer begins in the pigment-making cells called melanocytes. It is the most aggressive form of skin cancer. The subtypes include: Learn more about melanoma. Nonmelanoma skin cancer begins in a non-melanocyte skin cell.

Learn how to spot the differences between common basal cell carcinomas and rare melanomas, as well as differences in treatment.

By definition, melanoma IS malignant. Don’t be led astray when you see the double M. To some people out there, the double M implies that just “melanoma” means a benign mole or spot! Unfortunately, I see the use of the double M all the time on blogs and even medical sites written by so-called medical writers. It’s a common mistake.