Re: Strange U shaped lump
Phylobro, I think you are correct.
It looks like a subcutaneous nematode.
These can be self limiting in other sturdier herps, they are very common in Garters and other generalist feeders as they are easily removed manually, but it is a whole different ballgame of delicacy and approach with a dart frog.
You would need an AARAV practitioner for help.