Node or osteoma: A hard bump could be a lymph node but these usually are mobile. Sometimes the bone behind the ear (mastoid) is not smooth so may feel bumpy. If it sits right behind the ear lobe it could either be a part of the second cervical vertebra or a parotid salivary tumor which can be firm and slow growing. If it is enlarging i suggest it should be evaluated.
Answered 12/19/2016
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