The trapezius is a large band of muscles across the back, shoulders, and neck. Trigger points are raised spots along a band of muscle. They can be caused by exercise, inactivity, or poor posture, like ...

If you’ve got a lump on top of your shoulder muscle, you have a good chance of it being a trapezius knot. This type of lump in the trapezius muscle — called a myofascial trigger point — is among the ...