Canker sores, also known as aphthous ulcers, are uncomfortable and painful sores that appear inside your mouth. They can range from small, shallow, and round to large, deep, and irregular. Canker sores are not contagious like cold sores, but they can still be painful and bothersome, making it difficult to eat, drink, and even talk.… Continue reading Canker Sore: Symptoms, Diagnosis and Treatment