My tegu did too one time and I was really concerned about it until I saw old skin in his nostrils building a ball and defeats afterwards. This made a popping sound. Ares is so small. His breeder told me he had his shedding 2 weeks ago and probably will shed again in 2 to 3 weeks. I don't know if that could mean old skin in his nostrils. What concerned me is the feeling I had in my hand when I held his first quarter . I could feel the popping sound .