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In addition, it is also possible for swollen or enlarged salivary glands to also form a lump in the area you are describing behind the ear. This can sometimes occur if part of the duct draining the salivary gland into the mouth becomes clogged.
Painful lumps behind ear causes include: 1  Abscess â These are lumps that develop when tissue or cells become infected. 2  Dermatitis â This takes place when waxy dead skin cells or dry skin builds up and is joined by inflammation and redness. 3  Mastoiditis â The mastoid bone is found behind the ear and can get infected.