Hi, I'm a 20 yr old woman who's got a lump on her neck that comes and goes. It's just over 1 cm and is hard and painless. It never fully disappears but it bulges out sometimes then gets a little smaller. I can't move it around. Usually I never worry about it but a second one has started to grow. Last time I went to gp, he said it was just a cyst and would go away. I've been getting shoulder pains and just feel a little weaker. The lump is on the back of my neck by the hairline. Is it worth going back to the gp or should I just let it be?