Post op inflammation , edema, infection, may be contributing factors.
Thanks for your advice, scottma
Yes, this is my lower right chin and the skin just below my lip.
Anyhow, I have mu sensation back to normal on the next day of the surgery. Why the sensation losed again a few days later? I don't think I have done anything that could be able to damage my nerve deep inside.
Assuming you are referring to lower right chin and/or lip is numb, which is associated with post op edema or surgical trauma. Most nerve injuries tend to recover within 6 weeks to 12 weeks , if there was no gross surgical trauma occurring during surgical procedure. However, corticosteroid ,anticonvulsant, antidepressant, nutritional supplement such as vitamin B1,B6, B12, folic acid , and omega-3 fatty acid may help resume normal function.