This sounds like a classic case of "my house is too small". As soon as your transfer him the problem should clear up. Did you acquire him from a store? If so and they had him in a bigger tank before you brought him home it's probably because the ten gallon is too small and he's trying to tell you he needs more room. Just get him into the 20 gallon as quick as you can and hopefully he'll stop.

The noserub may be able to be treated with a very small amount of neosporin (NO PAIN RELEIF -- it will kill your frog) applied once a day or so until the wound seems to start to clear up. The neosporin is good to help heal and fight off infection, but get other opinions before you go and use it on your frog. I've never owned pixies, but I have used neosporin on my White's Tree Frog to good results and with no side effects so I don't see why you couldn't use it. This is just a suggestion though, wait til someone else replies before you use it please. And remember NO PAIN RELIEF!