ICOP causally related to secondary myofascial orofacial pain myofascial orofacial pain attributed to myositis 2025-07-01T17:48:14Z ICOP number: 2.2.2 Pain caused by myositis affecting one or more masticatory muscles, with clinical characteristics of inflammation or infection: oedema, erythema and/or increased temperature. It generally arises acutely following direct trauma of the muscle or from infection, or chronically with autoimmune disease. Limitation of unassisted mandibular movements secondary to pain is often present. Calcification of the muscle can occur (i.e. myositis ossificans). PMID:32103673 myositis Ava E. Cunningham