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

They may signal a need for medication, as in the case of an infection ... on the back of the ear and can be either hard or soft. In some cases, these lumps might be painful or tender, while ...

For example, a cyst, infection or fatty growth may feel soft to the touch. However, fibroadenomas and cancerous tumors may feel hard and immobile. Some people may experience pain with an armpit lump.

Riding in jeeps, touring in tanks and taking the bumps of basic training have caused such an increase in pilonidal-cyst disorders that some doctors call them jeep disease. Cause: an infection of a ...