Thank you for your question. If you are not having any severe symptoms, then it may most likely occur due to nerve irritation (neuralgia) , neuropathy or lack of blood supply. I would recommend that you consult with your doctor to evaluate above mentioned possibilities in details. Hope this helps.
Thanks for comment. I am NEW here. Just recently I've had rt. side of FACE only tingling sensation several times a day. NO ear. No lip. No eye involved.No Pain....Just rt. side of FACE tingling several times per day and getting worse each month. Doc says, 'Fifth Nerve sunds like to me'. That's it. No explanation! I Pray I don't have something which will get worse like MS. After 7 spine surgeries, cancer, both knee's operated on (ACL, etc. Playing too much tennis growing up) and more I cannot take it. Thanks goodness arms and leg are not affected like some on this site. I feel bad for them. The pain I understand because a botched spine surgery in 1995 left me in chronic pain. Thanks for any advice in advance. Giacomo