My dogs paw pad is torn! What do I do?

We were playing frisbee with her in the street (I live on a dead end - no cars) and we do this often and weve never had any problems, but she was limping so I took a look at her foot and she had the top layer of skin peeling off. It wasn't bleeding, but I assume shes in pain because of the limping so I put her in her crate. How to I help her? Theres no blood and it doesn;t look like a cut or scrape or anything.