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Some patients also have shortness of breath, an irregular heartbeat, or other heart problems. Many times, polymyositis is idiopathic. That means the cause of the disease is not known. But, there are some theories about the causes of polymyositis, including:
However, in most people who have dermatomyositis, all the symptoms of polymyositis occur. In addition, rashes tend to appear at the same time as muscle weakness and other symptoms. A dusky or purplish rash (called a heliotrope rash) can appear on the face with reddish purple swelling around the eyes.