English Medical and Health Vocabulary List, Definition and Example Sentences; MEDICAL VOCABULARY There are some essential medical vocabulary when you need to talk about injury and illness. Medical vocabulary for minor problems; Boil: It infected swelling with liquid inside it. Lump: swelling. I have a strange lump on my leg. I wonder what caused it. Rash: allergic reaction which makes your skin go red. When I used the soap my skin came out in a rash. Spot: red mark on the skin. When I was a teenager I had a lot of spots. You can look at Medical