Vetericyn makes a reptile skin and wound care spray that's great for dressing rub wounds. The nose rub my Sonoran boa gave herself healed up quite nicely when I started using it. The spray is only ~$15, so it's definitely worth the money!
If your retic's face looks like it's starting to swell, though, there may be some significant deep damage that you'll need a reptile vet to assess and treat. Treating a simple rub is one thing, dealing with trauma is another.
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