I am not taking any medications, have not had any surgeries before, and do not have any illnesses or conditions. i recently discovered a hard, immovable lump on the back of my neck. it is just about left of the back of the neck and is perhaps 0.5 to 1 inch above my hairline nearby left ear. Have attached an image as well. the size is small, and it feels somewhat growing day by day. to give you a better idea, if i am sitting with my neck up, and if i pass my hand over the region, i feel pain. even if i move my neck in all directions, and just pass my fingers over the region.