Got this blemish...how to remove

I noticed this the other day I was wahing my car. I ran my fingers over it...it's not a scratch as far as i can tell...not a deep one. Do i just rub it with something to remove it? I hate when people don't respect others property. They got my bumper too...

Any suggestions are appreciated. I'm not very knowledgable when it comes to body upkeep. I just have the basic sponge, soap, and cloth for my washes.