What could be causing the skin on my hands to get dark spots?

DARK SPOTS ON HANDS. Dark spots on hands can be due to age, sun exposure, medications, how long have they been dark? How old are you? Cannot tell without seeing. See your doctor and be reassured.
Age spots. A person ages, brown spots can appear on their hands. Brown spots, also known as liver spots and solar lentigines, tend to develop on the hands because of too much sun exposure. They are darker patches of sun-damaged skin caused by the overproduction of melanin in these areas. Other factors like genetics may also play a role in the development of these dark spots. For many people, unsightly.