I am dealing with a 19 year old, male patient with transient, unilateral swelling of the temporalis muscle. First episode took place in 2009. The patient is diagnosed with migraine. Patient reports that muscle becomes swollen during stressful situations that he „can’t put his glasses on”. The swelling is painful and disappears in about an hour. MRI revealed small nodule in the affected temporalis muscle. It is also visible in USG as hypoechoic lesion. Doppler USG did not reveal blood flow. The lesion is palpable and painful during palpation. However, I am not if it is a myofascial trigger point. Is it possible that the swelling is caused by temporalis muscle/fascia dysfunction? What other possible causes should be considered?