There are many methods to treat age spots successfully and many of them have scarring potential. Fortunately (or unfortunately), like most procedures, it is usually dependent upon the skill of the treating physician. In my office I may use lasers, liquid nitrogen, and topical medications to treat this problem, depending on the location and degree of pigmentation. By treating the area carefully, white spots and scarring are quite rare.
One of the safest and most effective ways to reverse numerous sunspots due to the effects of chronic sun damage to your skin is by using a combination of two prescription strength medications: 4% hydroquinone and tretinoin cream. Prescription strength 4% hydroquinone is better than any OTC product for lightening dark spots in the skin. These dark spots are typically due to chronic sun damage so daily use of sunscreens is essential in your treatment. Combining prescription-only tretinoin cream with hydroquinone will make it even more effective. I recommend the Obagi Nu-Derm System which uses both tretinoin cream and hydroquinone to visibly lighten age spots as well as the fine lines and wrinkles that are due to chronic sun exposure.
Some very nice before and after photographs of examples using these products can be seen by following the link below: