a single wound or opening which would otherwise be abnormal and unexpected in a tissue - a tissue is a group of cells in the human body.

LESION: "Cuts, bruises and open wounds are otherwise known as lesions."
Cite this page: N., Pam M.S., "LESION," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/lesion/ (accessed January 23, 2021).