I am a 21-year-old female and I had a child about 18 months ago. I weigh 125 lbs and I am 5'5". I didn't gain much weight while I was pregnant. I have a small umbilical hernia which will be repaired next month. What can I do about the small indent above my belly button? It wasn't there prior to my pregnancy. What is it and what can I do about it?