Foot injuries such as these can cause ulcers and infections.
Stress and spicy foods do not cause ulcers, but can make them worse.
Harry's stomach was covered in ulcers caused by his stress and pain.
However, there may be mutations of the disease that can cause ulcers on the exterior.
Even aspirin coated with a special substance can still cause ulcers.
The most common of these are abrasions and small ulcers caused by trauma.
There's a theory that it causes ulcers, and that's one I subscribe to.
The drugs are supposed to cause fewer ulcers than older pain pills, although evidence for that effect has been mixed.
Occasionally, they may cause ulcers - large sores in the skin - especially near the ankles.
Alcohol can also cause ulcers, stroke, heart failure and pancreatitis.