Is your belly button piercing red and swollen? How to tell if its an infection or normal irritation

An infected belly button piercing will be swollen and may even cause a fever — here's how to care for your new piercing to ...
New Scientist

We now know why a belly button becomes an 'innie'

Scientists have discovered a new abdominal structure called the umbilical sheath, which anchors the remnant of the umbilical ...