Pigmented lesions are the parts of the body where the melanin producing is disturbed. They can be present since birth but most often they evolve after a long lasting contact with the UV-rays. It is because melanin is activated by these rays.
The reasons why such spots exist:
Before starting the cosmetic procedures the endocrinal and nervous system disorders, which directly effect the development of the pathological process, must be found out. If a disorder is discovered it must be treated, otherwise the cosmetic procedures need to be performed regularly.