I scratched/dented my car right underneath the bodyside molding 4 months ago and was quoted $2k for repairs. I bought a touch up pen to try to smooth the scratch out and paint over it to prevent rust.

Fast forward 4 months of winter, I discovered today that the scratch has been rusting. It also looks like there's rust underneath/around the scratch that's not visible.

Is there anyway I can still salvage it myself to prevent further damage/rusting or do I have to take this to a shop?

by Beginning-Mistake-49