i've never heard of an eyebrow piercing sagging unless the person put to heavy of a jewelry in it. the only real risk is of an infection if you do not properly clean it per the piercers after care instructions. we always prefer to use the circular jewelry because of ease of cleaning and straight barbells pull on the skin too much and can actually grow out. if you decide to take it out the scar is very very minimal. just make sure you go to a licensed tattoo shop or piercing shop to have it done.