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the black substance obtained on the skin after hard rubbing are actually the dead cells of the skin epithelium which on rubbing mixes with the natural moisturizer i.e. sebum and comes on the skin as the black substance

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13y ago
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Wiki User

11y ago

Your answer is to be found in the link I will make below. It is a bit to lengthy to repeat here.

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Q: What causes white discoloration spots on black skin?
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