Which action is a well known symptom of body dysmorphic disorder?

i know a lot of people who simply just do this...

" Symptoms of body dysmorphic disorder (BDD)
spend a lot of time comparing your looks with other people's. look at yourself in mirrors a lot or avoid mirrors altogether. go to a lot of effort to conceal flaws – for example, by spending a long time combing your hair, applying make-up or choosing clothes. "