I'm 20 years old and for the past year I've discovered lumps on the bast of my hairline, by my chin, and some in my head. At first my family physician gave me amoxicillin to see if the lumps would decrease in size and two did, however I just had one surgically removed and the ENT surgeon who performed the surgery said that the lump was benign, however he isn't quite sure of it's cause and I might discover others in the future. Best bet, get it checked out. I didn't want to go at first, but thanks to a paranoid yet persistent mother, I went to the doctor. If you're older, your chances of it being more serious increase. Please see a doctor so you'll at least have some peace of mind.