I Have A Swollen Lymph Node On The Left Leg

I have a swollen lymph node on the left leg at the top in my groin that appears to be shrinking. My left inner side of knee is tender , left ankle sometimes weak, some joints - elbow, fingers sometimes tender. No fever. I jog about 12 miles a week when not training for a run. Is this something I should call my doctor about? I am 66, female.