Skin sunspots are flat, brown or black spots that come in all different sizes. They usually appear on areas that are regularly exposed to sunlight such as the face, back of the hands, shoulders, and arms. Sunspots are common in people over 50 years of age and people who are regularly exposed to the sun. Sunspots are normally harmless and do not require treatment. However, they can be removed or lightened for cosmetic reasons.