Conversation: The conversation between human and AI assistant.
[|Human|] I have had two large hard knots pop up overnight on my head and then last night two smaller ones pop up behind my ear where the bone is. These are not moveable or painful but are eraser sized to quarter size knots. Not sebaceous cysts. What can they be? I am caucasion, 43 years old, 147lbs  and in good health.
[|AI|]  Hi, dairy have gone through your question. I can understand your concern. You may have some enlarged lymph node. It can be due to reactive hyperplasia most likely. It can be some soft tissue mass or some cyst like lesion. You should take a course of antibiotics. If it does not respond to treatment then biopsy diagnosis is advisable. Hope I have answered your question, if you have any doubts then contact me at bit.ly/ Chat Doctor. Thanks for using Chat Doctor. Wish you a very good health.