Oral ulcers
More common causes
Aphthous stomatitis
Syphilis
Human immunodeficiency virus infection
Hand-foot-and-mouth disease
Oral candidiasis
Oral cancer
Infectious mononucleosis
Cytomegalovirus infection
Lichen planus
Less common causes
Bullous pemphigoid
Crohn's disease
Herpangina
Pemphigus vulgaris
Erythema multiforme
Oral leukoplakia
Reiter's syndrome
Oral trauma
Behçet's syndrome
Agranulocytosis
Acute necrotizing ulcerative gingivitis
Herpetic stomatitis
Cyclic neutropenia
Uncommon causes
Leukoedema
Sweet syndrome
Chemotherapy- and radiotherapy-induced mucositis
Periodic fever aphthous pharyngitis and cervical adenopathy
Pharmacological causes
Apomorphine hydrochloride
Asenapine ER
Auranofin
Aztreonam
Brentuximab vedotin
Buprenorphine hydrochloride
Bupropion hydrochloride
Bupropion hydrochloride SR
Bupropion hydrochloride XL
Cabozantinib
Cefuroxime sodium
Chlorambucil
Cidofovir dihydrate
Ciprofloxacin hydrochloride
Ciprofloxacin hydrochloride ER
Clomipramine hydrochloride
Cobimetinib
Cyclophosphamide
Cytarabine
Dactinomycin
Darunavir ethanolate
Dasatinib
Daunorubicin hydrochloride
Decitabine
Deucravacitinib
Diclofenac sodium
Diclofenac sodium DR
Divalproex sodium DR
Divalproex sodium ER
Doxorubicin hydrochloride
Epirubicin hydrochloride
Erenumab
Ertapenem sodium
Etravirine
Febuxostat
Fentanyl
Fentanyl ER
Fluorouracil
Fluticasone propionate
Fulvestrant
Gefitinib
Glatiramer acetate
Hydroxyurea
Ibandronate sodium
Idarubicin hydrochloride
Ifosfamide
Imatinib mesylate
Ipilimumab
Leflunomide
Lenvatinib
Linagliptin
Melphalan
Mercaptopurine
Minocycline hydrochloride SR
Mirtazapine
Naproxen
Naproxen DR
Naproxen sodium ER
Sitagliptin
Tiotropium bromide
Valgancyclovir hydrochloride
Venlafaxine hydrochloride
Vinblastine sulfate
Vincristine sulfate
Voriconazole
Zidovudine
Zolpidem tartrate
Zolpidem tartrate CR
Zonisamide