Child7years old has pulp polyp in first primary molar after 7days from extracted this tooth the area of socket apear blue and bleeding at night when he slept what the cause?

There has to be a clot in the gum hole where the tooth was extracted, there also should be minimal bleeding, that's part of the healing process. Blue is probably from a bit of trauma to the gum area from the extraction. If you are in doubt, call the professional who did the extraction.

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