It's awful close to the eye so putting anything on it will be difficult. I'd just flush it with water and keep him clean. Just watch for any swelling, pus, or discoloring, those are signs of definite infections.
Usually small gashes are not a problem and heal on their own unless they become infected. If you are worried, you can always call your vet and ask for suggestions on topical antibiotics that are safe for use near eyes. My parents had some antibiotic dust that could be sprinkled in eyes to fight conjunctivitis and I would assume that would work well, but I can't think of its name now.
Apsel der Schwarzbar -- Dark Sable -- 10/31/2013