In geomorphology, Tang Yin is called the Palace of Life, which can reflect a person's various destiny characteristics. For example, if Tang Yin is plain and ruddy and bright, it shows that his fortune is very good recently, not only his job is stable, but also he has a good wealth income.
If a person's birthmark is obvious in Tang Yin, then this person's interpersonal relationship may change greatly, especially it is difficult for lovers who are suitable for them to live in peace. The longer you spend together, the more likely you are to have conflicts. It can be seen that birthmarks on Tang Yin are usually not a good thing.