Yes, following removal of lymphnodes, it is possible to have swelling of the lymphatic channels, but these will cause whole arm swelling
. It could be that the swelling
just began with the finger
. Other possibilities are arthritis-rheumatoid, injury, inflammation of the sac of joint, finger *****, insect bite, allergy or contact dermatitis to something, tendon injury or inflammation, clot in blood vessel, infection of the skin or pulp of the finger etc.