Home > Dermatology > Diagnosing Melanoma Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Feb 26, 2010 by JNJhealth, Views: 7325 Diagnosing Melanoma: Dermatologists look the ABCD's to see if a mole may be melanoma. A- asymetry B-irregular Borders, C-multiple Colors, D-Diameter- how large the melanoma is.