The most common causes for blood coming out of the belly button will be either the presence of a skin infection in the umbilicus or an infection in the urachal remnant, as reported by ZocDoc. The umbilicus is an ideal environment for bacterial or fungal growth because it is moist. The urachal remnant is a duct that lies between the bladder and the umbilicus and is where urine is drained from the fetus during the first trimester of pregnancy.
If the bleeding is caused by a skin infection, then the medical professionals will most likely prescribe a topical antibacterial or antifungal cream although oral medications are also a possibility.
If the bleeding is caused by an infection in the urachal remnant, then the infection will be treated first. Once the infection is under control, some medical professionals may recommend surgically removing the urachal remnant either laparoscopically or by making a small incision to the lower abdomen. This type of surgery is minimally invasive, and patients are expected to stay in the hospital for only one or two days after the surgery has been completed. There is a small risk of infection after the surgery; however, this can be easily treated with antibiotics.