Are mouth sores always the result of angular cheilitis?

Are mouth sores always the result of angular cheilitis?

Cracked lip corners aren’t always the result of angular cheilitis. There are many conditions that can cause lip or mouth sores, including:

• Actinic keratosis, or rough skin patches that can be precancerous.
• Herpes simplex virus type 1 (HSV-1), also called fever blister or cold sores.
• Leukoplakia, white patches in your mouth that can be precancerous.
• Oral cancer, which is cancer in any part of the mouth.
• Oral lichen planus, a disease of the lining of the mouth.
• Syphilis, a sexually transmitted infection (STI) that can cause red sores on the mouth or genitals.