...I think you are on the right track by seeking another opinion. While we are not doctors and cannot diagnose, we can suggest you follow up with a dermatologist. If you have noticed changes in color and texture, it's worth the time to see a doctor for another opinion. I always follow the mantra, "When it doubt, have it checked out."
It sounds like you are already well-versed in the signs of skin cancer, but I am including an article that contains some reminders about what to watch for during self-checks along with an article on performing self-exams.
https://skincancer.net/clinical/abcdes-melanoma
https://skincancer.net/diagnosis/self-examination
Please keep us updated! We are here for you any time!
April, SkinCancer.net, Moderator