Is it actually under a layer of paint or on the surface ?
Depending on what paint you used, a Q-tip moistened with rubbing alcohol, should take it off. Wait until the paint is dry.
Go easy on the alcohol and be gentle.
Glue marks 'on' the paint can be removed with a light solvent, but most solvents can burn/blush the paint. If it's in the paint, you'll have to wipe with solvent and start again.