Stomatitis (Oral Mucositis) By Bernard J Hennessy, DDS, Texas A&M University, College of Dentistry Reviewed / Revised Feb 2022 | Modified Sep 2022 View Patient Education Etiology Evaluation Treatment Key Points Topic Resources Herpes Stomatitis Secondary Herpes Simplex Pemphigus Vulgaris (Oral... Candidal Stomatitis Primary Syphilis (Mouth Chancre) Noma (Gangrenous Stomatitis) Oral Hairy Leukoplakia Some Causes of Stomatitis Oral inflammation and ulcers, known as stomatitis, may be mild and localized or severe and widespread.