Canker sores (mouth ulcers)
Canker sores (mouth ulcers) are among the most common medical conditions that affect the mucous membranes lining the mouth. When a canker sore develops, it might tingle and burn at first, and then become painful after that. These white-reddish spots usually heal on their own. Gels, creams or mouthwashes can help to relieve the pain.