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small bump on back of head no pain small lump on back of head no pain hard bump on back of head no pain hard lump on back of head no pain hard lump on back of head not painful small bump on the back of my head not painful is it normal to have a small bump on the back of your head what does a small bump on the back of your head mean why do i have a small bump on the back of my head why do i have a small lump on the back of my head
