Hi pennye,

That sounds like the location of part of the masseter muscle. The soreness indicates a spasm in the muscle. It is difficult to massage that muscle yourself without making it feel more sore.

It may be helpful to apply moist heat for about 20 minutes on the outside of your face over that area as that can help break up the spasm. Do this especially before you go to sleep at night. Also resting the jaw is actually very helpful at releasing the spasm. This means eat a soft food diet, nothing chewing or sticky that would require a lot of jaw movement. Do not open your jaw wide and be mindful if you are clenching your teeth during the day. If you are... stop yourself when you notice it. Do you wear a night guard?

Sometimes chiropractic care is helpful. Some people take anti inflammatory drugs like motrin or advil especially just before bed time. Others use homeopathy like apis or arnica pellets.