Vincent looks great! How long has he had this bump on his jawline area?
It could be a cyst, abscess, or a bone irregularity. What type/brand of UVB light are you using?
If it doesn't seem to bother him, then you could give it a bit of time, to see if it changes in size or
shape. I would keep an eye on it, just to be sure it doesn't get worse.
Is he eating well?
Ok, so it just suddenly came up. Could he have gotten bitten by a cricket possibly?
At least it isn't getting bigger at the moment.
So the UVB light is a compact/coil type of bulb? If so, you will need to change to a long,
fluorescent tube bulb, such as the Reptisun 10 or the Arcadia D3 12% or 14% tube. The
UVB exposure is much better than the compact/coil lights are.
Let us know how things are going. I hope it doesn't get any larger.