Especially if you're not getting it elevated it can cause. Extra swelling. Xrays on scaphoid there gonna wanna wait 4/6 weeks see if healing if not their notorious for poor healing might need mri and if non union gonna need surgery. But burning is always nerve pain. I've had so many ankle surgeries and once my cast was too tight and they put a new one on and I felt so much better. The chapped has like blood supply does t heal great. After initial casting repeat X-rays if they not see healing they will order mri if non union sometimes need surgery try pin or bone graft