I was once told, “as long as you check regularly you’ll know it when you find it.”
I’ve also been told it’s very hard and dense feeing. Sometimes rough feeling.
I think this helps a lot but it sure feels like insufficient training.
This also gave me an app idea. I have very mole-y skin. Doctor said to keep an eye on new ones of significant size. I have a terrible memory. Maybe I need an app that I can snap photos of my major moles and it will tell me if future photos match or are possibly new, based on my mole constellations as pattern matching.