A lesion is an abnormal area on or inside the body [that looks different from the surrounding tissue and might be caused by injury or disease].
- A skin lesion can be a bump, sore, or discolored patch.
- A brain lesion can cause symptoms like headaches or difficulty speaking.
Very Simple Definition:
A lesion is a part of the body that is not normal because it is hurt or sick.
- A cut on your skin can be a lesion.
- A bump in your brain can be a lesion.