About 5 years ago my husband noticed a hard bump
(non movable) right behind my right ear, in the bony area. Thought nothing of it but would mention it to the ENT. He walked away muttering, questioning mastoiditis.
These last few years, I have developed another firm, non movable lump just under it but oddly, it seems to reduce in size a little. They are near perfectly round. They do not hurt and no discoloration of the skin.
Occasionally my ear aches just a little on that side.