Conversation: The conversation between human and AI assistant.
[|Human|] I have a lump on the back of my head toward thd bottom of the skull. It is tender and sore to the touch. About the size of a quarter. It is on the right side but I have also had them the same place on the left side. I get them a few times a year, they least a few days and go away. I have gotten them for years but never thought to much of it. But I am wondering if it is something normal that other people have too.
[|AI|]  Hi, Looking to the history it seems that there might be having enlarged tender lymph nodes. It shows that there might be having some scalp infection like dermatitis, fungal infection or Dan Chat Doctor. When active infection is there, there might be enlargement of lymph nodes and with regression of infection it becomes clear. Consult your doctor and get examined and treat the cause. Take regular hair bat. Ok and take care.