What are the stages of melanoma?

This video is from the Animated Patient's Guide to Melanoma https://www.YouAndMelanoma.com, developed by the Melanoma Research Foundation (MRF) and Mechanisms in Medicine Inc.
The mission of the Melanoma Research Foundation is to eradicate melanoma by accelerating medical RESEARCH while EDUCATING to and ADVOCATING for the melanoma community. To learn more about the MRF visit https://melanoma.org.

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Video description:
Melanoma expert Jeffrey Weber, MD, PhD, talks about stages 1 through 4 of melanomas that appear on the skin, why doctors “stage” them, and how staging helps doctors and patients decide on treatment. He also discusses how skin, eye (ocular) and mucous membrane melanomas are staged differently.