Please help with neck anatomy!

[Lady123]

I can see a strong pulse in the left side of my neck but I can see a longish bump that’s moving up and down. It’s a few inches under my jaw. If I turn my head the bump disappears. What is this? Trying to stay rational. Can’t feel it on the right

[AnxietySufferer]

I can feel a little bump under my chin. Something ive been fixating on for a while but it hasnt changed in a year