...I am glad you are being proactive and doing self-checks. Those are so important.
I am including an article on the signs of melanoma. No matter how long your mole has been there, it is important to check it against the ABCDEs of melanoma. This memory tool can help you determine whether a spot is suspicious enough to warrant a visit to a dermatologist.
https://skincancer.net/types-signs/melanoma-look-like/
You mentioned that it is two colors. In my experience, my doctors have always been extra cautious with anything that has two colors or two shades. I would advise you make an appointment to see a dermatologist or your family doctor to be on the safe side. If it is not possible to see a doctor in person, you might consider a telehealth visit first.
Please keep us updated on your progress. Wishing you all the best! April, SkinCancer.net, Moderator