How is a finger sprain normally treated?

Early motion. It is important not to immobilize a finger sprain for too long as the finger can get stiff quickly. I would suggest getting your finger moving, avoiding activities that aggravate the pain, and gradually advance your activities as tolerated. Anti-inflammatories such as Ibuprofen can help with the pain andputting your hand in a sink full of warm water can help get your motion back & it feels good.