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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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Wiki User

16y ago
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Wiki User

11y ago

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

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Suzan Picard

Lvl 2
3y ago

Lack of oxygen

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Q: What causes fingers to turn black?
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