Hello, for many, many years i have had a small lump right behind my right ear. it s close enough that i can place a finger in between the space from the lump to the back of my ear. it used to be mobile, and i could move it around, but lately it seems to be stuck onto my bone or muscle, and i can t move it. it s semi soft, semi hard, and has a dull pain if i press it. should i be concerned?