Syphilis, a sexually transmitted infection (STI) that can cause red sores on the mouth or genitals.Oral lichen planus, a disease of the lining of the mouth.Oral cancer, which is cancer in any part of the mouth.Leukoplakia, white patches in your mouth that can be precancerous.Herpes simplex virus type 1 (HSV-1), also called fever blister or cold sores.Actinic keratosis, or rough skin patches that can be precancerous.There are many conditions that can cause lip or mouth sores, including: Are mouth sores always the result of angular cheilitis?Ĭracked lip corners aren’t always the result of angular cheilitis. Blood tests check for illnesses or nutritional deficiencies. They may do a mouth swab to test for viruses like herpes or fungal infections. Your primary healthcare provider or a dermatologist (provider specializing in skin conditions) can diagnose angular cheilitis.
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