Gular edema can be fatal if not treated and is caused by over supplementation. Like carol said it could be the angle of the pic, but i can see what she means .
You will also need to repot your plant in organic soil. If you got it from lll then it should already be pesticide free and you don't have to worry about repotting it. It would also be a good idea to cover the exposed soil with smooth river rocks to prevent consumption by your cham.
Cobalt is a very unique panther and he seems like he is maintaining his yellow very well. He has beautiful coloration and looks very healthy. Nice work, Olimpia.
-Michael Ryan
Hello and welcome, I'm also located in San Diego. When you buy a plants you must repot them with organic soil. I recommend happy frog soil from fox farms. You must also thoroughly rinse the leaves to remove all pesticdes and fertilizers. Once your done cover the soil in the pot with smooth...
For the most part, if this problem occured suddenly and not over a period of time it is most likely due to an injury, not with nutritional deficiencies. With that in mind, your veiled chameleon must have injured himself because of the fall you claim he endured, however what he damaged I cannot...