Conversation: The conversation between human and AI assistant.
[|Human|] I noticed a lump on my 4 year old sons head 3 weeks ago. He said he was hit on the head at school with a block. I am worried because it hasnt gone away. Do u think it might be cancer. His attitude has also changed. He went from being a sweet boy. To being a tantrums thrower. Please help.
[|AI|]  Hello! Thank you for the query. Brain cancer (if that's what you think of) can not be palpated from the outside of the skull. It develops inside. So no, this is not a cancer. As he has had some injury, this lump can be a hematoma caused by this injury. Other lesions like sebaceous cysts are also possible. But this really does not sound like a cancer. Please consult a surgeon with this issue. Hope this will help. Regards.