Café-au-lait spots are light brown skin marks that can vary in size and shape. They are usually flat and can appear anywhere on the body. These spots are often harmless and are commonly found in people of all ages, but they are more noticeable in individuals with lighter skin tones. While café-au-lait spots are generally benign, having multiple spots can be associated with certain genetic conditions, such as neurofibromatosis type 1. It is important to monitor these spots for any changes, and consult a healthcare professional if there are concerns about their appearance or number.