Mouth sores can be a symptom of lupus or a warning sign of a lupus flare. They may or may not be painful, but they still need medical treatment. Lupus is a chronic autoimmune condition that causes ...

Lip ulcers are cold sores, and canker sores are a type of mouth ulcer. Both can cause pain and discomfort but typically clear up without medical treatment. Lip ulcers are another name for cold sores.

Francisco J. Rivera Rosario is a science communications editor experienced in developing all types of science content including, scientific journal articles, infographics, medical educational videos, ...

While you’re receiving treatment for cancer, some of the drugs you take can cause painful sores to develop inside your mouth. You can also get them if you’ve had a bone marrow (stem cell) transplant ...