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The skin
characteristic, is mainly based on sebum secretion quantity,
and can divide into dry, oily, normal and combination
type.
(1) Dry skin
For dry skin the pore is not obvious, sebum secretion
quantity is little and the skin is not oily, skin is
delicate, the skin color is clean, red and nice looking.
In epidermis cuticle water content is little, often
below 10%, therefore this kind of skin cannot withstand
outside stimulation. After exposing to the summer daylight,
skin will be blush and in cold winter it is easily dry
and crack. This kind of skin is easy to get old and
wrinkles. Therefore this kind of skin needs to pay attention
to skin protection. Its PH value is approximately between
4.5~5.
2) Oily skin
For oily skin the pore is thick and rough, sebum
secretion is more, skin color is beige, brown, the skin
is greasy, showing oily look over the face. This kind
of skin can withstand external exposure to the sun,
wind and rain. It is not easy to have wrinkles and aging.
But this kind of skin has excessively sebum secretion
and can cause pore blockage thus it is easy to grow
white heads and affect the beauty. Its PH value is between
5.6~6.6.
3) Normal skin
Normal skin has a proper sebum secretion quantity and
the water content is and the skin is not dry, oily,
rough or too delicate. This kind of skin is not too
sensitive to external stimulation and is a normal, healthy
and ideal skin. But it is influenced by the seasons,
in summer it tends to be greasiy, in winter it tends
to be dry. Its PH value between 5~5.6.
(4) Combination skin
Combination skin also has two kind of heterogeneities
of skin types, so it is called combination skin.
(5) Allergic skin
The pores of most allergic skin is thick and sebum secretion
quantity is a lot. But the main thing is that this kind
of skin after using cosmetics (also sunlight illumination,
certain chemical products) after the use cosmetics and
so on) can cause the skin allergy, inflamed, itchy and
rash will appear. |
