18 سنوات
How can I return my skin color back after becoming darker from the sun ?
18 أغسطس 2014
UVA is a longer waveform and penetrates the skin deeper, activates melanocytes and damages DNA.
UVB is a shorter waveform and penetrates the skin shallow and also damages DNA (at a shallower level).
UVA is the type of UV radiation that doesn't burn you, but still activates the melanocytes to produce color.
UVB is the type of UV that does burn you (along with activating melanocytes), UVB also aids in oxidizing melanin to become brown while UVA doesn't.
All types of UV do DNA damage. This is why the melanoytes release melanin. The melanin (pigment) is released into the skin as a pinkish color and oxidizes to brown (hence the tan). Melanin is responsible for absorbing UV light (and other forms of light), that's why we appear darker after we get a tan. The melanin is used as a natural sunscreen to absorb the UV light before it can do more DNA damage.
To regain the original color, avoid the sun. In time, the skin cells filled with the color will wash off the surface and then underlying 'whiter' cells will become visible. If it needs to be done faster, it can be done with certain types of bleaching solutions (while faster than waiting for it to naturally go away, still takes a fair amount of time to bleach out).
Keep in mind that what really happens is that the DNA damage causes MSH (melanocyte stimulating hormone) to be released. This hormone is really what is responsible for activating the melanocytes to release melanin. People who are 'white' without color don't produce MSH constantly. Other people who have darker skin produce some level of MSH consistently that constantly has the melanocytes producing melanin.
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