What are the signs that someone you know is developing body dysmorphic disorder?

Examples below:: Preoccupation with your physical appearance. Strong belief that you have an abnormality or defect in your appearance that makes you ugly. Frequent examination of yourself in the mirror or, conversely, avoidance of mirrors altogether. Belief that others take special notice of your appearance in a negative way. The need to seek reassurance about your appearance from others. Excessive grooming.