Have you undergone any recent surgery on the right leg, ankle or the
foot? Is there any history of varicose veins or defective valves
in the leg veins? I hope you are not taking any hormone like estrogens, perimenopausal? This needs urgent attention by a surgeon. Have you been checked for diabetes? It could be an abscess needing urgent drainage. You must go to the emergency room and an urgent x ray done to check for any ankle fracture.