How did the fortune teller know you had a birthmark?

There are four main reasons for the formation of general birthmarks. First of all, external environmental factors, whether rural or urban, have been polluted. When people are stimulated in a polluted environment, they will react, and the appearance of birthmarks is one of the manifestations; Second, the living environment, due to bad habits formed in life, or irregular diet and sleep, may cause birthmarks; The third is heredity, which is also considered to be an important factor causing birthmarks, but there is no exact scientific basis; Fourth, malnutrition, due to the lack of certain nutrients or trace elements, leads to a large amount of pigment secretion, forming a birthmark.