Phrynosoma platyrhinos- Desert Horned lizard health question

I have a couple desert horned lizards and I'm aware of their care needs and have done a lot of research regarding all of that, but what I am having a hard time find is common skin problems for the guys. One of the two horned lizards has two pink bumps under his neck. They just appeared one day from the next and have I'm not sure what might of caused them. I have one idea on what it might be because the lizards eat ants I thought it could be a couple of ant bites that the lizard got while eating. Otherwise I have no clue and was wondering if anyone had experience on this, any help is appreciated thank you.

Calling a vet tomorrow as well to try to set up appointment.