[Skin Concerns] These spots appeared on my sisters hand and the derm was of no help

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They arose about two weeks ago suddenly and are painful. If you can see, there's a tiny crater in the center. The dermatologist said she thought they might be cysts and referred sis to a hand surgeon but that doesn't seem right to either of us. If anyone has any ideas as to diagnosis or treatment that would be great
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Submitted by MetalandIron2pt0