Hello. I have this dime size lump on the left crown of my head. I didn t hit my head. I have had it lanced several times since it showed up over three weeks ago. NO pus came out at all and only a very little bit of blood came out.it is very painful as well and if I brush my hair or hit it in anyway it causes me a headache. Should I go to the ER and have it checked out? I thought of ingrown hair but figured my body would have absorbed it by now cause it s been over three weeks since I first noticed it. What s your opinion of what my next course of action should be ? Thank you so much for any insight