Ache in my top right side of my back hurts to lift arm i think it's pulled muscle how long to heal and should i not excercise with it?

Tincture of time: A pulled muscle is the presence of "micro-tears" among some of the fibers within that muscle. They cause a certain amount of swelling, which causes the pain. Depending on the severity of the injury and the age and medical status of the patient, these symptoms can last from a few days to a few weeks. Allow it to heal rather than continue to injure it with more activation of the muscle.