You should do some First Aid work...

1) WASH his nose - Warm Water on a washcloth

2) CLEAN the wound - Hydrogen Peroxide is good

3) Apply Neosporin Ointment to and around the wound

The Hydrogen Peroxide will *foam* when it's working in the wound...
Put as much as you can INTO the wound.
Don't let him lick/drink it or we'll have an upset tummy!

The Neosporin WILL help - even if he licks most of it off.
Depending on How Fast he removes it - RE-apply several times.

Once you clean the wound - you'll be in a better position to
determine if he needs a trip to the Vet.

Let us know how he is...

/s/ Phred