What is myositis?

Weakness>Pain: Myositis is inflammation of muscles caused by autoimmune attack of the muscle tissue. It can sometimes be painful but the primary symptom is progressive weakness (over weeks and months). Affected muscles are usually proximal (closer to the body) such as shoulders and hips while wrists/hands and feet are usually spared. Sometimes accompanied by Raynaud's and purple/red rash around eyes and on chest

Muscle inflamatiin: Myositis means muscle inflamation. It can occur where a muscle has been injured.