I am a surgeon. The thing on your head is probably a sebaceous cyst, but there is also the possibility of lipoma. Don't be afraid, young man. It's nothing serious. Both of these things need surgery, but they can be taken out through a small incision. Sebaceous gland cyst is like bean curd residue, lipoma is fat and benign. Don't be afraid. There is a very thin absorption line now, so don't take it out. You can wait until the holiday to go to the hospital for surgery. Don't leave after being hospitalized. This is local anesthesia. Just take some anti-inflammatory drugs after operation, but hanging water is better. I wish you a speedy recovery! ! ! ! !