Sudden darkening of the skin may be caused by physiological factors, such as ultraviolet radiation, changes in hormone levels, and melanin deposition due to diet. It may also be caused by the action of drugs and pathological factors.
1. Physiological factors: continuous ultraviolet radiation, resulting in increased skin melanin synthesis, skin color black; pregnancy hormone level changes in the body, resulting in abdominal skin black; often eat fried, additives too much food, due to melanin precipitation resulting in black skin; long-term friction stimulation, resulting in black skin.
2. Drug factors: taking chlorpromazine, quinine and other drugs during the skin color black, the main consideration and the impact of drugs.
3. Pathological factors: malignant acanthosis nigricans, a tumor-related disease, may lead to a significant deepening of pigmentation in the short term. It is necessary to consult a doctor in time for standardized diagnosis and treatment.
To summarize, there are many reasons for the sudden darkening of the skin, and it is recommended to go to the hospital for a clear diagnosis.