I've been trying not to cut, but I slipped up a few days ago. My problem is, I realized I have my homecoming dance on Saturday. I looked at the cover-up thing in the resources and I can't really wear armbands to the dance so I don't really know what to do for cover up. : /
One thing that also works is getting a lightweight cardigan that goes with your dress and wearing it over top. You can get away with it since it's fall and beginning to get really cold - especially at nights. And you can still see your dress with it.
There's also special cover up - as mentioned below that is made specially for scars or waterproof.
Another way would be to get small gloves or maybe even a corsage? I know people were a bunch of corsages at the homecoming in my school this year - and it'll probably cover it and serve as a distraction.
Up until this Saturday though, try to moisturize as MUCH as you can. Those vitamins and such that are in most moisturizers will help heal them.