Methylene blue dip double strength for 10 minutes, twice daily if you can. It will help cautherise the wound and remove dead tissue.
I would go the route of antibiotics. The holes in the head are often caused by internal infections. It is then normally a sign of pretty advanced disease. It does not have to be fatal. I have had angels and bettas recover from this in my younger years... when everything was still treated by malachite, methylene or salt.
Would have responded earlier, but my motherboard decided to throw in the towel, I've had a pretty vexing two days rebuilding my PC and getting everything the way it was.
Cape Town, South Africa.
Hi. I'm back.