Pigment Changes in Skin
Skin color is primarily defined by the amount of melanin, a pigment that is genetically defined depending on race and ethnical origin. Exposure to UV rays further stimulates and intensifies the pigmentation. Cumulative effect of long-term solar or artificial UV radiation leads to the skin damage and rapid skin aging.
It is especially evident these days because of senseless tanned skin trend. The consequences are manifested in skin atrophy, patchy pigmentation and early appearance of small wrinkles in photoexposed areas. This pigmentation is known as poikiloderma. Melasmas are pigment patches on forehead, upper lip and cheeks. Often present in pregnant women, less usually seen as a result of endocrine disorders, they are the most frequently activated during the sun exposure.