Bumrungrad in Bkk has an excellent dermatology center, I speak from experience. Not cheap but very good.
I have had numerous basal cell carcanomas excised so consider myself a fair expert. Liquid nitrogen is only effective for keratosis, pre-cancerous lesions. Surgery is required to confirm entire excision of affected tissue.
Most of the Bangkok Hospital chain have dermatology units, I use the Bangkok Samui for my events.
Please feel free to pm me if I can be of any help. Good luck!