...it sounds like you are already ahead of the game by doing self-checks, and that is great. While we aren't doctors and cannot diagnose, we can share advice based on our own experiences. If this is a spot that seems new to you, it would be worth having a dermatologist check it out. There are different types of skin cancer with many different signs and symptoms. A dermatologist is your best bet--they will be able to tell you more and may even suggest a biopsy.
I am including a graphic that may help you as you do those self-exams.
https://skincancer.net/clinical/abcdes-melanoma
Keep us posted. We are here for you!
April, SkinCancer.net, Moderator