Ulcer
From Wikipedia, a free encyclopedia written in simple English for easy reading.
An ulcer is a kind of open wound. Ulcers can be on surfaces of the body. They can be on skin. They can be mucous membranes like the surface of the stomach or inside the mouth.
Ulcers start when the top layer (surface) of skin or mucous membrane is hurt. This top layer dies. When it dies, the skin or mucous membrane and opens. This leaves an open sore called an ulcer.
Ulcers can be from infection with germs. Ulcers can be from pressure on a part of the skin. Ulcers can be from substances that will burn skin or mucous membranes. When acid makes some stomach ulcers this is from burning by the acid. Ulcers can be from cancer. Ulcers can be from diseases of blood vessels. If not enough blood goes to a body part, it can get an ulcer.
