ANSWERS: 4
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I'm not a doctor, so you should take this up with a medical professional. I am thinking that dried blood appears black. Maybe the lining of your nose is irritated and weeping a bit of blood.
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dried blood, nose hairs?
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the same vitamin deficiency that causes fingernails to have black lines in them...a vitamin deficiency...
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Exhaust fumes. I always find that happens when I spend some time walking around in the city.
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