Under the irradiation of ultraviolet rays, melanin in the basal layer divides a lot, and melanin pushes up continuously, accumulating in the stratum corneum and forming spots.
First, internal factors.
1, pressure:
When people are stressed, they secrete adrenaline to prepare for stress. If you are under stress for a long time, the balance of human metabolism will be destroyed, the supply of nutrients needed by the skin will tend to be slow, and the pigment mother cells will become very active. Chen Hui; Plastic laser beauty center; Tang Dou Hospital; Fourth Military Medical University;
2. Hormone imbalance:
The female hormone estrogen contained in contraceptives will stimulate the secretion of Melanie cells and form uneven spots. Although the spots formed by birth control pills will stop after taking medicine, they will still stay on the skin for a long time. During pregnancy, due to the increase of female hormone estrogen, spots are easy to appear from 4-5 months of pregnancy, and most of the spots that appear at this time will disappear after delivery. However, abnormal metabolism, skin exposure to strong ultraviolet rays, mental stress and other reasons will deepen the spots. Sometimes the newly grown spots will not disappear after delivery, so you need to pay more attention;
3. Slow metabolism:
Spots can also appear when liver metabolic function is abnormal or ovarian function is decreased. Because of poor metabolism, or endocrine disorders are in a sensitive state, the pigment problem is aggravated. Constipation can form spots, which is actually caused by allergies caused by endocrine disorders. When the body state is abnormal, ultraviolet radiation will also accelerate the formation of spots;
4, the wrong use of cosmetics: the use of cosmetics that are not suitable for your skin, leading to skin allergies, such as excessive exposure to ultraviolet light during treatment, skin in order to resist external aggression, will gather melanin pigments in the inflamed parts, leading to pigmentation.
Second, external factors.
1, UV:
When exposed to ultraviolet rays, the human body will produce a large amount of melanin in the basal layer in order to protect the skin. Therefore, in order to protect the skin, more pigments will gather in sensitive parts. Frequent exposure to strong sunlight not only promotes skin aging, but also causes pigmentation skin diseases such as black spots and freckles;
2. Bad cleaning habits:
Because of strong cleaning habits, the skin becomes sensitive and will stimulate the skin itself. When the skin is sensitive, in order to protect the skin, melanocytes will secrete a lot of melanin. When there is too much pigment, there will be skin pigmentation problems such as spots and flaws.
3. Genetic genes:
If parents have spots, the probability of spots is very high, which can be judged to be the function of genetic genes to some extent. Therefore, people at home, especially those with spots on their elders, should pay attention to avoiding ultraviolet radiation, which is one of the important factors causing spots. Pay attention to sun protection!