Chronic oral diseases secondary to COVID-19 infection or vaccination: clinical cases and a narrative review.

OBJECTIVES:Autoimmune activation by COVID-19 infection/vaccination has been postulated to be responsible for initiating or reactivating multiple types of oral mucosal immune disorders. These include oral lichen planus (OLP); oral pemphigoid, either bullous pemphigoid (BP) or mucous membrane pemphigoid (MMP) with oral involvement; pemphigus vulgaris (PV) with oral involvement; or Sjögren's disease. In addition, chronic conditions such as oral burning, xerostomia or changes in taste and/or smell have also been linked to COVID-19 infection/vaccination. DATA SOURCES:Part 1 (mucosal conditions): an English-language literature review of Pubmed, Web of Science, Scopus, and Embase was performed searching cases of OLP, oral BP, MMP, PV and COVID-19 infection/vaccination, with additional cases from the authors' clinical practice presented. Part 2 (non-mucosal conditions): Cases of initiated or flared Sjögren's disease, chronic oral burning, or xerostomia after COVID-19 infection/vaccination from the authors' clinical practice were aggregated. Our literature review discovered 29 cases of OLP following COVID-19 infection/vaccination. For BP, 10 cases were identified after infection/vaccination. The number of PV cases following infection/vaccination were 28. The majority of mucosal cases were reported after vaccination. Most reported initial disease, but a substantial amount included recurrences of existing diseases. Non-mucosal disease: Sjögren's disease, chronic oral burning, or xerostomia after COVID-19 infection/vaccination cases totaled 12 cases identified from the authors' clinical practice, with the majority occurring after infection. CONCLUSIONS:Chronic conditions after infection with COVID-19 or vaccination remain relatively rare and self-limited, yet reinforce the importance of comprehensive history taking involving COVID-19 to differentiate potential etiologic factors for these conditions.