Dr. Siri Chiewchanwit has a Clinic (week nights in MoonMuang Rd, ChiangMai just down from Ratchadameon Rd, next to a small temple.
His day surgery is on 5th Floor Sriphat Hospital (brown building).
He has a scope and can zoom in on your nodule and identify then advise you of appropriate action ie freeze or removal. His rates are very reasonable.
You need to be there before 8am to get a Cue number on the ground floor Reception where you Register; go to the 5th floor where his nursing staff are..he then arrives about 9am.
You won't be disappointed.
Best of luck.