I had balloon compression surgery for trigeminal surgery in October and ever since I have numbness in my mouth, gums and tongue on the right side. Also in the upper and lower lips. My neurosurgeon says he was not near this area. I do have slight numbness in right cheek area as predicted.
Thanks for your query, I have gone through your query. The numbness in the cheeks, lips, and gums can be because of the injury to the trigeminal nerve. Even a slight touch or contact of the nerve during balloon compression can result in nerve injury. Nothing to be panic, it takes few months to recover. Meanwhile you can take nerve regenerating Chat Doctor.  I hope I have answered your query, take care.