So im 21M and have major health anxiety! i found a lump in my collarbone/shoulder and went to the GP the same day, they said it felt like muscle/fascia but im not sure! i had a bit of a scare 2 year ago with some lymph nodes in my neck which turned out to be ok (had a nasalendoscopy done) the lump moves, does not hurt, flexes(?) when i suck my tongue and cheeks in, and when i turn my head the o er was it stiffens and is unable to move, im unsure if this could be a lymph node or not! its not there on the other side or if it is, its not visible. i am also quite a skinny man as im about 180cm 11st and have a few small palpable lymph nodes in my neck for a few years now, but this isnt small!