"Nickel sized" refers to an object or area that is approximately the same diameter as a U.S. nickel coin, which measures about 0.835 inches (21.21 mm) across. This term is often used to describe small items, such as blemishes, spots, or other features that are roughly the size of a nickel, making it a relatable reference for size. In various contexts, such as in medical descriptions or product specifications, "nickel sized" helps convey the scale of an object without needing precise measurements. For example, a blemish on the skin or a sticker on a surface might be described as "nickel sized" to give a clear visual idea of its dimensions.