It's been hurting badly for 2-3 days now and I tried cleaning it. Blood came out. Bright red, not brown.

First off are you a guy or a girl.

Endomitriosis could cause bleeding from the naval in females; but it's rare.

It could also be a hernia or something with the liver because embryonically the umbilical cord is connected to the liver area (so maybe portal hypertension).

Any other symptoms?