"Spots" suddenly appear around the eyes and mouth, on the forehead and cheeks, and other particularly noticeable areas of the face.
For women, these "blemishes" are often a source of great annoyance. Do you know why they appear?
Ultraviolet rays have harmful effects on the skin, but the human body actually has a mechanism to counteract them. That mechanism is "melanin pigment."
The phenomenon of skin darkening after sun exposure is called "suntan," and this is caused by melanin pigment in the body.
The melanin that increases when exposed to ultraviolet rays acts like a black filter that protects the skin.
Then, the increased melanin is shed along with the keratinocytes through the skin's turnover process, and gradually the skin color returns to normal.
However, prolonged exposure to large amounts of ultraviolet radiation can damage skin cells, leading to continued melanin production or impaired melanin excretion, resulting in areas of skin that remain dark for extended periods.
This is one of the causes of "blemishes." This involves not only ultraviolet B rays (UVB), which cause redness of the skin, but also ultraviolet A rays (UVA).
Ultraviolet A rays (UVA) can penetrate clouds and window glass, so they can affect your skin even on days that aren't sunny, and even indoors.
Therefore, to prevent age spots caused by the accumulation of ultraviolet rays over many years, it is especially important to be careful about UVA rays, which are exposed to year-round.