What does it mean that Tang Yin has a blue birthmark?

On the face, I think that face can be divided into three stops, and there is no loss of face if there is harmony and symmetry between the three stops. The top dead center is the position between the eyebrows and hairline, which is what we call the forehead, which shows the importance of the forehead in the face. Some people have moles or small birthmarks on their foreheads. What explanation should they make in fortune telling? Let's take a look at what it means to have a blue birthmark on your baby's forehead in birthmark fortune telling.