I am so sorry both of you are dealing with this worry. I know how stressful it can be when a new spot pops up.
I am including an article with some ways to identify suspicious spots. While we are not physicians, we can recommend that since this is a new lesion, it would be best to see a dermatologist or your family doctor. A dermatologist can best guide you and perform a simple biopsy if needed.
This article contains a memory tool for the characteristics of melanoma:
https://skincancer.net/types-signs/melanoma-look-like
It sounds like you are both ahead of the game and have been diligent with skin checks. That's a definite plus!
Please keep us updated! We are here for you both any time!
April, SkinCancer.net, Moderator