Final answer:
A lesion is any abnormal change in the skin's structure or function that can be caused by a variety of factors, including trauma, infection, or diseases like cancer. In the context of skin cancer, lesions exhibit distinct features such as asymmetry and irregular borders.
Step-by-step explanation:
A lesion is B) Any abnormal change in the skin's structure or function. It is not limited to a contagious skin condition, a benign tumor, or a fungal infection. A lesion can be a broad range of things including cuts, rashes, bumps, and areas of inflammation. It can be a result of a wide variety of factors, including trauma, infection, or disease processes like cancer. In relation to skin cancer, a lesion can refer to an area of the skin that has undergone DNA damage due to UV radiation and may be cancerous. These cancerous lesions often have distinctive features that can include being asymmetrical, having irregular borders, being very dark in color, and potentially having greater diameter, which are illustrated by the mnemonic ABCD (Asymmetry, Borders, Color, Diameter).