I have a pea-sized bump in the back fold of my left knee. It can t be seen, but you can feel it under my skin. When I get chills, stand too long, or sit too long, it causes great pain. I was once told that it s probably just a hair follicle on a nerve. It s been here for eight years and has gotten a little bit larger over the years. It is hurting now because I m sort of cold.
Hi, Dear,Welcome to Chat Doctor. Based on the facts of your query, You seem to suffer from-Sebaceous cyst / chronic furunculitis/ or could be Varicose Veins with Short Saphenous Incompetent valves. Pain on long sitting / standing too long, may suggest DVT association with thrombophlebitis. Chills with it favor the thrombophlebitis factor with it. Chronicity of the lump 8 yrs makes it more of Dormant Sebaceous Cyst with recent activated re-infection.USG/ Color Doppler dual Imaging of the lump, would fix the Varicose cause of it. Contact with a Followup Premium question to ME. Will appreciate your Hitting thanks and writing excellent review comments to help needy patients like you. suggests Good Day!!  Chat Doctor. S. Genl-CVTS