The navel of a normal person will have more or less local concavity. If there is no concave hole, it may be the reason that the umbilical cord left in the belly place at the time of birth is relatively long due to the cutting of the umbilical cord, resulting in the umbilical cord shrinking after it is still not concave. If there is local swelling and pain, it is generally normal and does not require special treatment. There is another situation, that is, there is an accumulation of fluid or infection under the skin of the navel, causing local swelling, so that the skin inside the navel is protruding outward and formed, generally there will be pressure fluctuations or there is a flushing of the surrounding skin, skin temperature, swelling, pressure pain, etc., must be anti-inflammatory to deal with, if necessary, must also do local skin incision, to exclude the fluid or pus inside If necessary, a local skin incision must be made to remove any fluid or pus.