Clinical general chloasma divided into three types:

① Face Central: The most common skin lesions distributed in the forehead, cheek, upper lip, nose and under the chin;

② Cheek: Bilateral lesions are mainly located in the cheek and nose;

③ Mandibular: skin lesions are mainly located in the mandible, even involving the V-neck area.

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Although the skin after a strong sun and easy black, but black skin is not necessarily caused by “UV” ! The ultraviolet sunlight can stimulate the melanin in the skin, freckles and other skin diseases, affect your appearance, in addition to ultraviolet light, in fact black skin will have many reasons:

1, bathe too much force

Some people like taking a bath when forced scrubbing skin, that it will clean some more, do not know too much force or repeated scrubbing, can lead to skin black.
2, Food

Some food is also changing the root cause of black skin, rich in copper, iron, zinc and other metal elements such drawbacks of food. This is because these metal elements can be directly or indirectly, to increase the production of melanin and casein ammonia, tyrosinase dopamine unitary and the number of substances, such as Queensland and activity. These are the main food animals liver, kidney animals, oysters, shrimp, crab, beans, walnuts, black sesame seeds, raisins, and so on.

3, drugs

Many drugs alter the normal colour, taking quinine to about 10 percent of patients face a blue pigment spots. In sedative drug, chlorpromazine Qin I pose the greatest threat to the colour of a long period of time users face, neck appeared chloasma, arms, etc., in brown ash, light blue or light purple. In addition, repeated use of mercury ointment, but also in the patients left the brown pigment. Anti-cancer drugs has caused more colour changes in the drug, bleomycin can produce melanin accumulation, and so on.

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