A few days ago I bent my middle finger backwards (hyper-extended?) , and ever since then it hurts to move it. The middle knuckle is visibly larger and red with a bluish tint. When I squeeze it, it causes pain. Also, when I try to bend it, it will not contract all the way down. It will move on its own, but it hurts when I try to exercise it. I didn t know if It could be jammed, dislocated, or pulled a tendon.