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There is a small hard bag under the left side of the back of the head

Jan 16 20223 people replied
Description Of Condition:

Hello, doctor. There is a small hard bag under the left side of the back of my head. It feels painful when I press it, but it doesn't hurt very much. It's a little big when lying down and a little small when sitting up. I don't feel it at ordinary times. What's going on?

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