However, despite the relatively high number of diagnostic criteria proposed, melanoma diagnosis remains problematic in a large proportion of cases, with possible diagnostic discord, even among experts.12–14 13.
Farmer ER, Gonin R, Hanna MO. Discordance in the histopathologic diagnosis of melanoma and melanocytic neoplasms between expert pathologists. Hum Pathol 1996;27:528–31. [PubMed] / This reference is meant for you to get more information,but best to follow your derm and pathologist who are well equipped to give you the best advice.
You,or your derm should always inform the pathologist that it is a previously removed mole which can show severe dysplasia.However let me confess my knowledge is rather less than the counterparts since in the third world we come across melanomas less often.