BDD stands for Body Dismorphic Disorder. Which basically means you don't see your body the same way everyone else does, it appears slightly grosteque and in severe cases, abnormal.
For those of you who don't know what it feels like I will explain due to I, among many others have this. Having BDD is like knowing something but feeling it isn't true. You know something looks normal but you feel as if it isn't, and that feature begins to bother you, you start to feel that everyone only notices that certain feature. Eventually the feature you dislike may prevent you from doing certain things, going swimming ect.
I understand many of you who are reading this probably won't care but a few of you may so if you believe you have this disorder there's a website containing a quiz in which you can figure out if you have it or not.
To those of you who have BDD you're beautiful regardless of what you think.