Ulcer/ˈʌlsər/ Definition 1 of 2Pro Tip 1/3Medical Condition Use 'ulcer' to refer specifically to medical wounds, not minor cuts or scratches. She had to be treated for an ulcer on her leg. Pro Tip 2/3Internal Sores Remember that ulcers can form inside the body, not just on the skin. His doctor diagnosed him with an internal ulcer. Pro Tip 3/3Serious Implication An ulcer often implies a serious health condition requiring medical attention. Ignoring the symptoms of an ulcer can lead to severe complications.