Normally inner layer of the nose nostrils have blood vessels at the extreme outer layer of the skin in the nose. When we sleep, mucus gets solidified, and in the morning when we try to remove the solidified mucus, this also damages the blood vessels and hence the blood in the mucus. But this lasts only for a moment as the blood vessels are very thin and they get closed either by the clotted blood or by the skin itself. This also causes little irritation or pain in the nose and a tendency to remove mucus again and again. But if the bleeding is more hurry to your ENT specialist.
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