Get it checked out by a doctor as it there are a number of
causes. It is possible it is a sebaceous cyst, which is very common
and easily removed.
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∙ 16y ago
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Q: Bump on back of my head that just appeared for no reason it is sore hard. about the size of a quarter. It is sticking out. also I have a small pea size hard bump same side but behind my ear.not sore?