<s>[INST] I have a swollen lymph node to the back of my head that seems to swell more during times of stress & when my BP is elevated. It is very tender @ times & sometimes not enlarged, but never completely goes down. I have had this problem for about three years and did receie workup to check me for lymphoma years ago. [/INST] Hello,This sounds more like a sebaceous cyst than a lymph node. A biopsy could be done to see if it is a lymph node or cyst. In either case it could be removed if it is bothering you.Regards </s>