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the most probable diagnosis is lipoma, a benign tumor out of fat cells. This is a quite common tumor and becomes more probable when you can move the lump a bit. A lipoma is not hard as wood but softer. If you can't shove the lump for- and backwards, and if it is quite hard, you should be concerned.
The pain is caused by the pressure of the lump which irritates the skin nerves.
Anyhow you should see your doctor, because no doctor can make a diagnosis from the far (it is against the law, too). Please make it urgent if the lump is hard as wood and not movable.
I wish you the very best!
Then you should be at your doctor's asap.
I keep my fingers crossed for you!
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