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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. [1] 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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References

  1. ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN  978-1-4160-2999-1.