Hurt arm. would it be broken, sprained,or deep tissue bruise? what is the treatment for a deep tissue bruise? puffy on left side of left arm below the wrist . hurts to touch. can move it but feels stiff. what should i do ?..."

Is there any trauma to that area? If yes, X-ray of the wrist should be done to rule out fracture. If no history of traumatic injury, apply cold pack to the area as needed for pain relief + taking ibuprofen OTC 200 mg x 2 with food q 6 hours as needed then move your wrist when pain has improved. If swelling and pain do not resolve after 3 days you should see your doctor.