I think you can let it heal naturally, unless it starts to look infected.
Did you use your fingernail when you scraped it? Was it your zipper?
I would just use a very gentle soap - not your usual man soap, but maybe Ivory or Dove for Sensitive Skin - and keep it clean. Don't scrub it, just very gently clean it with a clean towel, and pat it dry.
If you find it scraping or rubbing against your clothing, you can make a bandage with gauze and tape, and if it looks infected try a little neosporin on the bandage.