Keywords: MESH: "COVID-19 Vaccines/adverse effects"; Vulvar aphthous ulcer, COVID-19, Vaccine, Female, Humans, Aphthous stomatitis, Ulcer/diagnosis/etiology, Vulvar diseases/diagnosis, Adolescents, Genital ulcers, Lipschütz ulcers, Non-sexually transmitted vulvar ulcers, Assessment of methodological quality, Case series, Methodological guidance, Risk of bias, Systematic review.