Thanks for writing to the forum!
What you have is probably an umbilical hernia. In itself, it is not dangerous. However it can increase in size, trap the underlying intestines and cause either ischemia of bowel or intestinal obstruction, both of which are medical emergencies. Hence most doctors advice a surgical repair. Please consult your PCP to start with and get a referral for a surgeon.
Hope this helps. It is difficult to comment beyond this at this stage. Please let me know if there is any thing else and do keep me posted. Take care!