I’m a huge fan of TBDP (total body digital photography). The doctor who I see at the Melanoma Clinic at UNC recommended this service to me due to a history of melanoma, and having so many moles.
Also, in between appts I mark any suspicious moles on a printable body map and bring it with me for easy reference with the doctor. For any additional questions or concerns, I keep a running list in my “Notes” app.