Hence it could be Trigeminal neuralgia, abscess in tooth, exposed root canal, internal ear infection, maxillary sinusitis, TMJ, migraine, herpes (recurrent) without
rash or fibromyalgia localized to face.
If the pain is due to TMJ, you will find it linked to either opening your mouth wide or to chewing. Also, touching the swelling on the joint aggravates the pain. To get some relief you can try massaging the sore muscles. You have to press on muscles of your face to look for sore points.