New discoveries indicate that the skin stress mediated by sunlight continues for hours after the skin has been exposed to UV irradiation; it continues even at night-time.
Sunlight induces the generation of oxygen and nitrogen radicals that bring the skin’s own melanin to an excited state. Subsequently, the melanin transfers this excess energy to the DNA, which ultimately causes delayed skin damage, so-called ‘dark CPDs‘.1
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Exposure to UV radiation is the major cause of physiological skin damage, such as photoageing and erythema. Recent research, however, has shown that UV-induced skin damage can occur several hours after the radiation and even at nighttime. Alarmingly, it appears that half of the damage caused by sunlight actually occurs long after exposure to the sun.1
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