When allergies cause swollen lymph nodes, you'll typically notice a pea-sized (1-2 centimeter) tender lump under your skin, usually in your neck, behind your ears, or under your jaw or chin.

Lymph nodes are part of your lymphatic system, ... These are most often felt on either side of the neck, under the jaw around the throat, or behind the ears. Related Stories.

Swollen glands in the neck are swollen lymph nodes and often mean your body is fighting an infection. Causes include viruses, bacteria, autoimmune disorders, and more.

You can feel them under your jaw, in the groin, and in the armpits. Other organs that make up the lymphatic system are the: ... Sometimes, a biopsy may be necessary on any swollen lymph nodes.