physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
Salivary gland tumors are possible causes of tiny lumps on the inside of the cheek, according to Merck Manuals. Oral cysts may also cause tiny, painless bumps inside the cheek, on the inner lower lip or on gums, says Simple Steps to Better Dental Health. Keep Learning.