Roi gave good solid textbook definitions!

Wouning means: 1.Causing physical or especially psychological injury 2.The act of inflicting a wound Injury refers to: 1.Any physical damage to the body caused by violence or accident or fracture etc. 2.An accident that results in physical damage or hurt 3.An act that causes someone or something to receive physical damage While Lesion 1.Any localized abnormal structural change in a bodily part 2.An injury to living tissue (especially an injury involving a cut or break in the skin) cowboy...

This is a simple but general explanation, not 100% accurate in every case: A wound is what is left after you are hurt (usually outiside the body where you can see it but can also refer to something inside). If you get a paper cut the resulting area is called a wound, but so is the area that was stabbed by a sword. Most importantly, a wound is something that needs to heal. A lesion, on the other hand, does not always need to heal. A lesion could be anything from red bumps to a tumor, or the damaged skin around the tumor. A lesion is talking about abnormal tissue in the body, usually because it's been damaged, but a wound is talking about the area of damage that needs to be healed. I wouldn't say that lesion is an everyday word, but scar is (the damaged tissue left after a wound heals). An injury is just a general term for something that damages the body but NOT because of a disease, as in a car accident or tripping down the stairs. You would say "Tom was injured while running. He fell onto a rock which split open the skin on his knee and broke his leg. The doctor says that it will take a month for the wound on his knee to heal, but because of his leg injury, he won't be able to run for a year." I hope that this was helpful and not too complicated. Just remember wound=the result of bodily damage (not caused by disease), which needs to heal, injury=damage to the body (not caused by disease), lesion = damaged tissue (caused by disease).

You mean: wound; injury; lesion. wound = a scar on the body (or mind). They are definitely visible. You get wounded on the battlefield. injury = more general term for wound. Wound is a kind of injury. Sportsmen suffer injuries. They are usually internal, but can also be external, just like a wound. lesion = scar caused by internal disorders or illnesses.