The darkening of the forehead is considered to be related to long-term ultraviolet radiation, post-inflammatory hyperpigmentation, and melioidosis.
1. Ultraviolet radiation: summer ultraviolet radiation is relatively strong, if the long-term outdoor, long time to accept ultraviolet radiation, may lead to forehead blackening.
2. Post-inflammatory hyperpigmentation: acute and chronic inflammation in the forehead, the medium of inflammation leads to active melanocytes in the skin tissue, resulting in increased melanin synthesis, which leads to localized pigmentation-like changes.
3. Melanosis: Melanosis, also known as occupational melanosis, is related to special occupations with long-term exposure to tar and oil, rubber and certain dyes, resulting in hyperpigmentation of exposed areas of the skin. It usually takes the form of spots that gradually increase in size, centered on hair follicles.
It is recommended to reduce occupational exposure, do not be under ultraviolet light for a long time, and if necessary, go to the hospital dermatology department for examination, to find the causes of forehead blackness, but also to give targeted drug treatment.