My dermatologist watches close my 2 moles on my back. Each time I come, he mesures it and checks if they grow or not.
This year one of them grew a bit and he said it needs to be removed. He was so right: the margine cells started to change.
I also having a treatment now on a top of my nose: basal cell carsinoma and I treat this with a cream. What a bloody mess this is, but it needs to be done.
Good luck to you and don't be afraid to ask your DR if any concerns.