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A 37-year-old member asked:

What causes blue or purple spots on iside of lips of mouth?

1 doctor answer2 doctors weighed in
Dr. Joel Doyon
Cosmetic Dentistry 36 years experience
Cheek bite for one: One cause can be a cheek bite that caused bleeding below the tissue, but not enough of a bite to cause a laceration or tear so that the blood leaked out into your mouth. Another reason could be a blue nevus. You should see a dentist to have the spots evaluated and then see if any treatment is needed.

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Last updated Sep 11, 2018
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