Ive had a mole for years its round, and all one color. 3 days ago, i picked at it and it got swollen then yesterday it started to scab a little, and a little bit came off, it scabbed more and then just now i scratched and the scab came off. normal?

Sounds pretty normal. If you can't stop picking at it, consider having the mole removed.

Have it removed, I agree. Send the tissue to pathology to rule out melanoma, among other conditions.

Any change in a mole should be checked out as things like becoming irritated or bleeding or scabbing can indicate something like a cancer. For a mole which has color (pigment) melanoma is a possibility. But other things like recurrent injury from picking at it can do that too. Another thing that acts the way you describe is actually not a mole, and not a cancer, but a seborrheic keratosis. Be seen