Age or sunspots on the hands are the result of unprotected exposure of the sun. They are usually brown or black in color and show up on the skin exposed to the sun. They usually show up around 40 years of age and increase in number as you age. They are harmless spots and can be prevented or lessened by using a good sunscreen on a daily basis.
If you already have them, the good news is that they can be removed. Sunspots are located in the superficial layers of the skin. Therefore they can be treated by a number of treatments. Home remedies and over the counter medications can work to lighten the sun spots but take months to show any significant effect.
Hydroquinone is the most common medication prescribed for getting rid of age spots. In more dilute concentrations it is available in some over the counter creams. A more concentrated cream requires a prescription. This usually takes one to three months to see significant improvement.
Occasionally, sunspots are resistant to topical creams. Fortunately chemical peels are your next line of defense or light based treatments such as IPL & lasers. Talk to your Plastic Surgeon and have an evaluation.