What is a lesion?

A lesion is defined as any abnormality in body tissue, which can arise due to a variety of factors such as injury, infection, or disease. This broad definition encompasses various forms of changes that can occur within the skin or other tissues, including sores, tumors, or any other irregularity.

When considering the other options, a sore or bruise pertains to specific instances of skin damage but does not capture the full range of what a lesion can be. A type of skin cancer is indeed a lesion, but this definition is too narrow as not all lesions are cancerous. Lastly, a condition of dry skin, while it can lead to lesions, is not itself a lesion but rather a condition that might make the skin more susceptible to them. Thus, the definition that encapsulates the most comprehensive understanding of what a lesion is would be that it is an abnormality in body tissue.