What is a term for a mark on the skin?

The term 'lesion' refers to any abnormal change in the structure of the skin, which can include marks, sores, or any area of tissue that has been altered due to injury, disease, or other conditions. Lesions can appear in various forms, such as spots, bumps, or rashes, and can be indicative of numerous skin issues.

Understanding the other terms provides additional clarity. The papillary layer is a superficial layer of the dermis that contains connective tissue and capillaries and is not a mark on the skin. A callus specifically refers to a thickened area of skin that develops in response to friction or pressure, while melanocytes are cells responsible for producing melanin, the pigment that colors skin and hair. These definitions highlight why 'lesion' is the appropriate choice when referring to a mark on the skin.