I have quite a large lump (approx 1inch circum) and approx half an inch high behind my right ear, just on the hair line. The lump is very hard and connot be moved under the skin. It isnt hot or painfull to touch.
It has been there over a year, its not a pimple, and has no head on it.
I did see a Doctor about it, and he said to come back in 3 months if it was still there, but Im thinking its probably nothing, so havent worried abour making an appointment.
If this is useful, I had a Goitre on my Thyroid about 2 years ago, that was removed by needle asperation.