I didn't find anything out. My blood tests and sonogram came out completely normal. I actually think maybe it was a skin infection of some sort. I recommend cleaning inside there with a Qtip and warm soapy water like 3x a day, and make sure you rinse and dry well with paper towel and a Qtip (try to get all the moisture out of the area, we don't always dry our belly buttons!) and then apply some antibiotic ointment. I just did that pretty much daily for about 1-2 weeks and it competely vanished without a trace.