The second period: Puberty is easy to form "post-inflammatory pigmentation" because of the exuberant secretion of sebaceous glands.
The third stage: women in their twenties and thirties struggle in the workplace, lack of sleep for a long time, great mental stress, excessive fatigue, and decreased adrenal sebum function, resulting in pigmentation.
The fourth stage: chloasma is easy to appear in pregnant women and is the most common pigmented skin disease in women; After forty or fifty years old, ovarian function gradually declines, and female hormone secretion is insufficient, which is prone to chloasma.
The fifth stage: senile plaques will occur in the elderly, which is a skin aging reaction and is also related to family inheritance.