BDD stands for Body Dysmorphic Disorder. It means you have an excesssively negative view of yourself physically. All the comments such as "I am ugly" e.g. on the "Post your Pictures" threads are examples. Person A says "this is my picture, but I am ugly". Person B says "no, you're not, and here is my picture, but I actually am ugly". Person A then says "no, you're not".
Often a particular feature is highlighted. One thing which is seen as less than perfect overshadows everything else which may be really good. That is an aspect of perfectionism, and also black-and-white or rigid thinking (if one small aspect is imperfect then the whole thing is worthless).
Magnifying physical faults is an example of the filter emphasising negatives and taking positives for granted. It is a dimension of unrealistic predictions e.g. how is it possible ever to get a job.