A bruise on the chest during pregnancy is a normal physiological manifestation. Especially in the second trimester, this symptom is more obvious. This is because the breast ducts expand and the breasts increase in size during the second trimester, which has the function of secreting milk to prepare for the baby’s milk after birth. This condition is influenced by the hormonal secretion in the body, so there is no need to be too nervous. During this period, you may also experience enlarged nipples and nipple coloring, as well as an enlarged and colored areola. Some pregnant women may also have small granular material on their nipples, which belongs to Montserrat’s nodules and is also a physiological manifestation. Usually do not wear too tight underwear, you should wear loose, cotton underwear, which is good for blood circulation. You can eat more fresh fruits and vegetables because they contain a large amount of vitamin C, which can enhance the elasticity of the skin and reduce the brittleness of blood vessels.