Pigment abnormality

The color of normal skin is mainly determined by the amount of melanin in the skin. Second, such as melanoids, carrots, pigments, and skin blood oxidation are related to the content of reduced hemoglobin. The manifestation of abnormal skin pigmentation is abnormal skin color. In addition to the increase or decrease of the above factors, it can also be composed of drugs (Apine, chlorphenazine), metals (such as arsenic, thallium), foreign substances (such as dyes, dust, tattoos), metabolites (such as jaundice) And skin pathological changes.