If you have a knot in your neck, it means some of the muscle fibers in your neck are continually contracting. This can cause neck pain that feels dull, achy, or sharp. The pain might occur at the knot or in a nearby area, like your shoulder or arm.

A lump on your neck could be anything from a minor infection to a serious condition. Most moveable lumps aren’t serious. In general, if the lump is soft and goes away on its own, it’s probably nothing to worry about. A neck lump that persists, grows, or hurts could be a sign of infection or other illness.

A pea-sized lump in your neck is usually a swollen lymph node. It’s most often a sign you’re fighting an infection, but could a a sebaceous cyst or a result of an insect bite or sting.

A lump on your neck can result from a viral infection or a benign growth. But sometimes it may indicate an underlying condition. A lump on the neck is also called a neck mass. Neck lumps or masses can be large and visible, or they can be very small. Most neck lumps aren’t harmful. Most are also benign, or noncancerous.