There are known inherited syndromes that predispose some people to developing melanomas (and at least one of these syndromes is also associated with an increased risk of pancreatic cancer, as well). However, other genetic factors, besides an inherited cancer gene mutation, may also predispose individual patients to developing melanoma.
In your case, I certainly agree with your Dermatologist's aggressive approach to surveillance, and her low threshold to perform biopsies. As your melanomas have been "thin melanomas" so far, your Dermatologist is doing a great job!
Sincerely/ Robert A. Wascher, MD, FACS
www.doctorwascher.com
www.oncoguard.com