That is really peculiar. The bony protrusion isn't invasive into the mouth cavity... only going outward from the face and not inward. Is there any chance this might be a bot fly larvae (or another invasive insect type parasite thing?) that has burrowed into his face? What are you doing to treat it? If you want to see if it is a parasite coat the area with something like petroleum jelly (since I don't think you can use rubbing alcohol on frogs) to suffocate whatever might be living in there then it will either back out (before it suffocates) or die and you can remove it. I have seen this happen a lot to rabbits so I'm not sure the protocol would be the same for amphibs... I'm still learning about them.

I'm curious, how could early MBD cause a bony growth this far into the animals growth cycl esp. if the MBD has been rectified? Excessive calcium growth to make up for the shortage when it was young?

Kind of on that same note tho... is there any chance it could be gout or psudogout? I know with pseudogout it is calcium deposits that will grow, insted of uric acid crystals, so it could present like a bony solid anchored protrusion but I thought it usually affected joints but if the face is made up of several bony plates it could be possible techinically. Here's a great link for more info http://www.triciaswaterdragon.com/gout.htm

http://www.cabi.org/cabdirect/FullTe...0093069421.pdf