This picture shows a small melanoma on the patients back, she found about it accidently when she went to massage place and the massager told her that she must check it out! Skin melanoma: cancer of the skin developes in the melanocytes (the cells which gives the skin its color), very serious disease because it effects the skin our biggest organ and it can metastasize to other parts of the body and cause death! PS: check big and irregular shaped moles which gets darker by time.