Why is the swelling in my arm persisting?

Last week Thursday I was involved in a Wakeboarding accident where the rope got tangled around my arm when I fell and ended up dragging me for about 100 ft. After the boat had stopped I unwrapped the rope from my arm to find some rope burn and numbness from the tight squeeze of the rope. However, today the rope burn is almost completely healed but the swelling where the rope was caught has not gone down. There is no black and blue bruising just a large ring around my arm that is relatively pain free...should I be worried/ get it checked out?