Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with a doctor.
Without the ability to examine and obtain a history, I can not tell you what the exact cause of the symptoms is. However I will try to provide you with some useful information.
Pain on the side of the head sensitive to touch may be indicative of something called giant cell arteritis or temporal arteritis. This is due to an inflammation in the temporal artery and other arteries in the body. Symptoms typically include one sided headache pain in the temple and jaw that may be triggered by chewing, but touching the skin can also exacerbate the pain. This condition can be diagnosed by a blood test called an ESR and a biopsy of the artery. It is very important to rule this diagnosis out as it is highly treatable and if left untreated it can lead to vision loss. It is exceedingly rare in younger peoplebut becomes more common as we age.
Another potential cause of temple pain is inflammation or arthritis of the temporo-mandiublar joint, commonly called the TMJ. This can sometimes occur due to bruxism, biting down at night or during the day, and other stresses to the joint. This is best diagnosed/managed by an orthodontist or an ENT, and treatment includes braces and other dental fixtures and sometimes muscle relaxants, depending on the exact cause.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.
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