That makes them slightly more susceptible to developing a sore in the corner of their mouth, according to Dr. Rambhia. "However, not every atopic dermatitis patient has angular cheilitis," she says.

Angular cheilitis, an inflammatory condition characterized by cracked, red, and sore mouth corners. While sometimes the corners of your mouth could be cracked and irritated as a result of the ...

Canker sores, also called aphthous ulcers, are small shallow ulcers that occur in the lining of your mouth. “They measure ...