A branchial cleft cyst is a birth abnormality that occurs on one or both sides of the neck. This atypical tissue may form fluid-filled sacs or passages that drain fluid on the neck surface. These ...

A pea-sized lump in your neck is usually a swollen lymph node. It’s often a sign you’re fighting an infection or a result of an insect bite or sting. The appearance of a pea-sized lump in your neck ...