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The most common cause of bleeding or discharge from the belly button is an infection of the skin in the umbilicus
Like any skin surface, the skin of the umbilicus can become infected. In fact, it may be more likely to become infected because it is moist and a good environment for bacteria or fungi to grow. If there is swelling, pain, or redness
of the skin in or around the belly button, then an infection is more likely. Topical antibacterial or antifungal creams may help or you may need oral medication.
Occasionally, a small cyst
or duct that extends into the abdominal wall from the belly button called a urachal remnant may be present. It can at times cause bleeding and may need observation or surgery.You will require a physical examination by your personal physician.
hope this will help you!Take care!