This could be due to irritation, infection or ulcer such as aphthous ulcers which occurs on the lining of cheeks,
tongue, lips and roof of mouth. This starts with a tingling or burning sensation that progresses to form a red spot or bump, with a white circle or halo around the lesion. The cause is unknown but physical trauma, stress, lack of sleep, sudden weight loss, food allergies, immune system reactions,and nutritional deficiencies may be contributory.