Pregnant belly button inside dirty, smelly, often caused by the following factors: first, umbilical infection, belly button long-term non-cleaning will lead to the accumulation of more dander, dander will be mixed with the umbilical skin secretion of oil, a longer period of time will cause infection, you can remove the dirt through a small amount of local alcohol swab wipe; second, the patient has umbilical ureteral cyst, which is due to congenital umbilical and bladder channel is not closed, need If the disease can be clearly identified, surgery is needed to cure the disease. During the treatment period, you should not eat too spicy food, such as chili peppers and spicy strips, and pay attention not to over-wash the umbilicus to prevent skin breakage and infection. If the disease cannot be relieved by self-treatment, you should consult a doctor.