Lesion
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A lesion is a non-specific term referring to abnormal tissue in the body. It can be caused by any disease process including trauma (physical, chemical, electrical), infection, neoplasm, metabolic and autoimmune.
Not all lesions require treatment.
Lesions can also be inflicted intentionally during surgery, for example to specific regions of the brain to treat epilepsy.
Lesion is derived from a Latin word which means "injury."