Melanin is produced by specialized cells called melanocytes and is stimulated by UV light. When skin is exposed to sunlight, melanin is able to disperse over 99.9% of the absorbed UV radiation causing the skin to tan and protecting the skin cells from damage. In some areas of the skin, the concentration of cells may vary - dense amounts of cells can create melanin “deposits,” causing dark spots. As we age, our cells become less diffuse and our skin becomes more susceptible to dark spots.
The biggest defense against hyper pigmentation is sunscreen. Because dark spots are generally caused by a reaction to the sun, sunscreen is going to help minimize that stimulation of melanocytes - preventing new spots and inhibiting existing dark spots from getting darker.
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