Upper arm hurts raising it fully extended to the side. No bruising, no bulging. What can I do? L

Rotator cuff . Pain with lifting the arm to the side may be caused by rotator cuff disease. This could be a simple inflammation, tendinitis or bursitis but may be a rotator cuff tear. Initial treatments include medications, therapy and possibly an injection. Workup may include x-rays or an mri. An orthopedic surgeon can make the diagnosis and start treatment.