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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.
An odd smell behind the ears is not uncommon. Many people describe this as smelling like Swiss cheese. There are several possible causes, such as: 1  Fungal or bacterial infections due to an oily scalp.  Build-up of dead skin cells and the bodyâs natural oil (sebum), which can cause the 'cheesy' smell.