Verywell Health on MSN: Lump behind the ear: Possible causes and diagnosis Medically reviewed by Sukaina Hasnie, MD Key Takeaways A lump behind the ear can be caused by swollen lymph nodes, which are common and usually harmless.Most lumps behind the ear are benign and can be ... This Week's Leaders in TTC After a Loss 6 Months+ The Bump Message Boards ... Choose Another Board Search Boards " A lump behind the ear can have many possible causes.

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The most common include swollen lymph nodes caused by an uncomplicated infection. These lumps are typically harmless and relatively easy to treat.