Sun spots (age spots), also known as lentigines, are harmless, flat, brown discolorations of the skin which usually occur on the back of the hands, neck and face of people older than 40 years of age.

These spots more than anything else, give away a person's age. Sun spots are caused by the skin being exposed to the sun over many years and are a sigh of sun damage. If you do not believe that these brown, ugly marks on the back of your hands and face are caused by sunlight, look at the skin on your inner thigh.

You will see that the skin of the inner thigh is completely devoid of age spots. Sun spots are harmless and do not need to be treated unless they are changing or getting bigger than the surrounding sun spots.