I've noticed a small raised lump under the skin directly behind my left ear lobe, it is not on the surface it feels like a wobbly lump which I can run my nail over and sort of flick it back and forth but it does feel attached to muscle/flesh if that makes sense. it feels about 3mm in diameter so pretty small. I've got some pain going down the left side of my throat/behind ear, I have been rubbing and prodding it a lot so not sure if that's why. Really worried what this could be, does anyone think I should be concerned?