Age spots are formed due to prolonged exposure to the sun. This causes deposition of melanin beneath the skin, which leads to the appearance of age spots on the skin. One may appear by itself, or a few may be clustered together. There are various factors leading to the occurrence of age spots, but the common ones include overexposure to UV rays, increasing age, and genetics.
Although age spots may sometimes look like cancerous growths, true age spots are harmless and don't need treatment. For cosmetic reasons, age spots can be lightened with skin-bleaching products or be removed by laser or chemical treatments.