<s>[INST] slightly painful knot on the lower part of my skull on the back of my head.(right about where my hairline is) about an inch and a half from my left ear. This "bump" comes and goes..I have had it before, exact same spot. But it goes away after a week or so...maybe less. I'm 33, weigh 150 pounds, and 5' 4. Female. It also does hurt slight. Almost feels better when I apply pressure, but when I do that I can feel it in my forehead and eyes. [/INST] Hi,Dear,Thanks for the query to HCM.In my opnion it appears to be folliulitis with infection-recurring and subsiding.But it needs to be investigated.I would advise you to take a surgeons opinion- or upload the photograph of it.That would resolve the risky concerns with it.Hope you got the answer.Wellcome if have any more queries in this issue. </s>