histologic lesion

A lesion is a structural or biochemical change in an organ or tissue caused by disease or injury. These changes can be evident to the naked eye (anatomic), visible only under a microscope (histologic), or detectable only through chemical analysis (biochemical).1

Histology is the branch of biology that studies the structure of tissues in relation to their function. Histologists examine thin slices of tissue, often stained with dyes, to observe cellular components under a microscope. This field is crucial in pathology for recognizing and classifying disease lesions, which can aid in diagnosis and prevention of more severe health issues.21