Why Do I Have a Lump Behind My Ear?

Lumps behind the ear are typically swollen lymph nodes responding to infections or irritation in the head and neck region. The most common causes include ear infections, upper respiratory infections, skin conditions like acne or eczema, and dental problems. Lymph nodes filter bacteria and viruses, becoming enlarged when fighting infection. Other potential causes include cysts, which are enclosed lumps under the skin that may contain fluid or thicker material, or, less commonly, more serious conditions. Many lumps are benign, and those caused by an infection may shrink as the infection clears, often over a few weeks. However, seek prompt medical care if the lump is very painful, red, or rapidly enlarging, or if it occurs with fever, drainage from the ear, worsening ear pain, or the ear being pushed outward. A lump that lasts longer than about 3 weeks, feels hard or fixed, or occurs with unexplained weight loss or night sweats should also be evaluated.