You really do not have to do anything except kept its cage clean. If your setup has any loose substrate move the gecko to a tank that is just tile or towels.
Some people treat with Neosporin to prevent infection, but this may be bad for them. I have read much conflicting info.
I have found that Repti-Wound helps cuts and abrasions heal nicely, I get plenty of reptile 1st aid experience thanks to the cats catching wild geckos.