Final answer:
The common name for an aphthous ulcer is a canker sore. They are painful, non-contagious, and usually heal on their own in one to two weeks.
Step-by-step explanation:
The common name for aphthous ulcer is canker sore. Canker sores are open, painful mouth ulcers that can appear on the lips or inside of the lip or cheek.
They are typically white or yellowish and surrounded by red, inflamed tissue.
These sores come in two types: simple canker sores, which recur several times a year and are more common in individuals between the ages of 10 and 20, and complex canker sores.
Canker sores are not contagious and typically heal within one to two weeks.
Factors that may contribute to the development of canker sores include viral infections, stress, hormonal changes, food allergies, immune system issues, or injuries to the mouth.