Definition, etiology, pathogenesis and clinical manifestations of chloasmaFirst, the definition: chloasma is more common in young and middle
Definition, etiology, pathogenesis and clinical manifestations of chloasma
First, the definition: chloasma is more common in young and middle-aged women with facial pigmentation skin.
Two, etiology and mechanism:
The ultraviolet irradiation, the use of cosmetics, pregnancy, endocrine disorders, drugs (such as contraceptives, chlorpromazine, phenytoin, etc.) trace element imbalance can cause chloasma, which caused by pregnancy also called cyasma, associated with elevated estrogen levels may disappear after childbirth; some chronic diseases (such as gynecological diseases, hepatitis, chronic alcoholism, hyperthyroidism, tuberculosis, etc.) in patients with visceral tumors may also occur; also may be influenced by genetic factors for the occurrence of the disease.
Three, clinical manifestation:
More accumulation of young women, men can also occur. Changchun aggravated in summer, autumn and winter to reduce. Good symmetry in the facial zygomatic cheek and a butterfly, also involving the forehead, nose and mouth week. The typical lesions of brown or dark brown patches of different sizes, clear edge. No symptoms. The course of disease is uncertain, can last for months or years.