looks like scale rot, i'm no expert on it, nor have i seen it on blueys. id vet the little guy, betterdine wash (watered down) on it will help regardless cos it kinda does look like its 'open'. let us know what happens, and i future i'd be a little more concerened as it appeared, not when it has advance to that state.
good luck
ren
2 of my adult Northern Blue-Tongue's have the same problem on their heads, its all because of male fighting and what l do is put a bit of Betadine on the wound after l give it a good wash, then l repeat the same thing everyday for 1 week.
After 1 or 2 sheds it should start to heal up and go away, as long as your Blue-Tongue does not get into another fight with another Blue-Tongue.
lf you a more concern about the wound l would get it to a VET ASAP, so they can have a good look at it good luck and hope it recovers from the wound.
It looks like he might have been fighting - is he kept alone or with other Blueys?.
I just separated two of my Stumpys from fighting this morning. Lucky I saw them when I did, as they were really going for it. They're both cut up the same way and bleeding on the head. It happens. Fighting wounds do heal up just keep an eye on it.
I've found with the Stumpys that you have to be careful when they cut each other's mouths fighting. The blood seals their mouths shut. You need to keep prising them open each day. I use a cotton bud and water to help open their jaws. I'm not big on using many chemicals or treatments. They fight in nature, so I leave them to heal the same way. I don't get as many problems with my Blueys fighting like that.
As for the VET, unless you're REALLY attached to the Bluey, it's not worth it. A trip to the pet shop and $50 will always replace a common Bluey in case one dies.
dont you think that separating your lizards is easier than what you have discribed above? there are no excuses for 'having to pry it's mouth open cos it's sealed with blood'. get a grip kids.
No. Separating them in the long term isn't easier. I have temporarily kept one apart from the other for a week tops, to make sure that it heals up.
They fight, it happens. I keep an eye on them when they do. I've found they fight in Sept/Oct during breeding season and again around Feb/March. Babies arrive around early April and then it all slows down for Winter.