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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.
Sinusitis/Sinus infections. The pain in the head that is sharp behind ears or behind eyes can be caused by sinusitis. Amid the varied types of sinusitis, sphenoid sinusitis usually causes pain sharp in the head from behind the eyes while others, such as ethmoid or frontal sinusitis can cause pain behind the eye or ear.