question: I have had a large size bump on the back of my head.  I went to the doctor when I first noticed it in 1983, he said not to worry that it looked to be a assist bump. If it does not get any bigger or have any pain not to worry.  Now, it has become liquid in form, redness and discomfort when I lay my head on the pillow.  Can you tell me anything based on what I have told you about it?