Anulcer is a kind of openwound. Ulcers can be on surfaces of the body. They can be onskin. They can bemucous membranes like the surface of the stomach or inside the mouth.
Ulcers start when the top layer (surface) of skin or mucous membrane is damaged. The top layerdies. When it dies, the skin or mucous membrane opens. This leaves an open sore called an ulcer.
Ulcers can be frominfection 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.Peptic ulcers are sometimes from burning by the acid in thestomach. Ulcers can be fromcancer. Ulcers can be from diseases ofblood vessels. If not enoughblood goes to a body part, it can get an ulcer.Stress can also sometimes cause ulcers. Ulcers are often very painful.
