Do you have that one Framed Dave? Its the pride of your collection isnt it, admit it! Cham weirdo!Howdy Abby,
I zoomed-in (and brightened-up) on your chameleon's photo. It looks to be the tip of a "plug".
Here's what they look like when removed (~3/4" long):
It is often the case that when a plug shows up dried-out, they end-up needing to be gently, slowly removed by the keeper or a vet. I've removed them from chameleons at stores, other's collections, and also my own Veiled.
If it doesn't come out on its own soon enough, you have your options .