You are doing a beautiful job so far. This kitten stands a good chance. I once took a homeless cat to the vet that had an injury so bad that it was infested with thousands upon thousands of maggots - you should have seen them run in all directions in the vets office(not to mention in my car

) - ewwwww squared. No being should have to endure the misery this poor cat was enduring. Anyway, the vet flushed them out and treated the wound and administered antibiotics and this exceedingly ill cat rallied.
You are smart to keep the kitten warm and cozy.
I assume you are using KMR or some equivalent kitten formula that has the nutrients they need at this extremely tender age - crucial. At only 2 weeks old, very frequent feedings are necessary which means you will get very little sleep for awhile.
As far as what to do next, I think that depends on whether the kitten is ill or "only" has this one wound that responds well. If you can, a vet would be my first recommendation. If you can't go to a vet unless absolutely necessary, see if it eats and poops well.
A vets office may at least offer you advice via phone and if not them, perhaps a kind hearted cat rescue group will help. This kitten may not have the antibodies it needs from mom, having been separated way way too early from her so that is a question for the vet.....
I am sending tons of good wishes for all good things here. JJ