Paint chipping

Hello I have two spots both at the rear doors where paint has come off and has started to rust. Is there a good sealer or something to put on these spots so that I don't have to go to the body shop to keep this from getting worse?

You need to sand the rust off or it will only get worse. Then get some touch up paint and cover up the spots. It won't look the greatest, but it's quick and should stop the rust.