Get it checked
You may or may not have a problem but any mole or pigmented lesion that is changing should be look at by your pcp or a dermatologist and evaluated on short order. As a lay person, you are not in a position to know the warning signs or symptoms or could mistake abnormal for normal.
Do not chance it! get it looked at and make sure. Sometimes things belong in a jar and not on your body! best 2 u!