How does the baby birthmark form?

Under normal circumstances, birthmark is a common skin disease, with the birth of a person, some birthmarks will change with age, there are some birthmarks will also cause some other diseases, leading to birthmark the primary factor is genetic, followed by external environmental stimulation. Or it may also be malnutrition, if the human body lacks trace elements such as zinc and magnesium, it will also lead to abnormal secretion of pigment cells, forming birthmarks. Finally, living habits, if not eating regularly for a long time, irregular personal life will lead to baby intensification of the body, the formation of birthmarks may.