How do freckles develop?
Freckles are caused by uneven distribution of skin pigment melanin in the skin.
Freckles become more prominent when exposed to sunlight
because the skin produces extra melanin in sunny conditions.
The sun and sun-tanning lights emit ultraviolet (UV) rays.
After exposure to sunlight, the outer layer of the skin (the epidermis)
thickens and the pigment-producing cells (the melanocytes) in the skin
produce the pigment melanin at an increased rate.
(This gives some protection against future sun exposure.)
People differ of course a great deal in their reaction to sunlight.
To take an extreme example, there is no pigmentation in the skin
of an albino because of a defect in melanin metabolism.
On the other hand, people with dark complexions are relatively less sensitive
to sun exposure than fair-skinned persons. However, persons with dark skin
are not entirely resistant to the effects of the sun and they, too,
can become sunburned with prolonged exposure.
blonde or red hair are especially susceptible since they tend
to be the fairest
skinned. Irrespective of skin color, it is the uneven distribution
melanin pigment in the skin that results in freckling. A freckle is
than an unusually heavy deposit of melanin at one spot in the skin.
age spots and pregnancy mask have several things in common.
They are formed in
sun exposed areas: face, hands, chest and back.
These unwelcome brown patches
are nothing more than accumulation
of skin pigment melanin which is always
produced by the skin.
The amount of melanin present determines the skin tone of an individual.
melanin is produced by the body in response to sun exposure.
It absorbs UV rays
and does not allow them to penetrate deep into the skin
layers as it would be
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