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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.
One painless lump behind ear type is called lipoma. This is a relatively harmless deposit of fat under the skin. It can also be found on the neck, back, shoulders, arms and thighs, but normally it is a soft painless lump behind the ear that is due to the development of fatty tissue that grows slowly under the skin.