Medically reviewed by William Truswell, MD A lump behind the ear can have many possible causes. The most common include ...

Medically reviewed by Daniel More, MD Allergies occur when your immune system overreacts to allergens like pet dander, pollen ...

A few days after I had a severe outbreak of canker sores I developed a swollen lymph node under my chin ... (such as a swollen neck node during an ear infection) may double in size, going from ...