A little help...paint question

Well like a dumass I used some "goof off" to help remove the little warning sticker on the tank below the gas cap trim. It did NOT want to just peel off. I had to rub and pick away with my fingernail. When I was done, I noticed the area was kind of faded. Apparently I took some of the clearcoat off. If you rub some oil on it, the faded area vanishes....so it looks like the paint is ok. How do I fix this? Can a paint shop just touch up an area or would the whole tank have to be redone?