Intraoral dental sinus
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Intraoral dental sinus (also termed a parulis and commonly, a gumboil) is an oral lesion characterized by a soft erythematous papule (red spot) that develops on the alveolar process in association with a non-vital tooth and accompanying dental abscess. A parulis is made up of inflamed granulation tissue.
Less commonly, dental infections drain onto the surface of the skin , forming a cutaneous sinus of dental origin.
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