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Normally parts which are bruised turn black. You probably jammed your thumb somewhere. It is the blood inthe bruised tissue that makes it look black.

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17y ago

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More answers

thumb just turned black. what is the cause of this problem?

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Wiki User

12y ago
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Lack of oxygen

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Suzan Picard

Lvl 2
4y ago
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Q: What causes fingers to turn black?
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