COVID-19 and oral lesions: 2020-2024 outpatient case series and literature review

Data on oral lesions of coronavirus disease (COVID-19) are conflicting, and there are few evidence-based data on oral lesions directly caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The aim of this case series and literature review is to determine the prevalence of oral lesions associated with COVID-19 in outpatients and identify oral manifestations that are likely associated with COVID-19. We present 15 patients that came for their first specialist examination to the Oral Medicine Outpatient Clinic, Dental Clinic, Split, Croatia between November 2020 and January 2024. Their medical and dental history was taken following CARE guidelines. The prevalence of oral lesions associated with SARS-CoV-2 was 1.42% during the 4-year follow-up period. The most common oral lesions were nonspecific erosions, stomatitis, salivary flow disorders (xerostomia, oligosialia), salivary gland diseases (sialadenitis, chronic sialadenitis), candidiasis, pigmentation, aphthae, burning mouth syndrome, and geographic and fissured tongue. The mean latency period was 25.1 days. The site most commonly affected was the tongue (61.5%). Oral lesions associated with COVID-19 occurred in middle-aged patients, with an equal distribution by sex. They presented in a mild form and did not correlate with the severity of the clinical picture of COVID-19.