Pimples comes from stresss???

well well some of you say pimples come from stress and some say they dont well i actualy read alot about pimples and asked my doctor. She said pimples dont come from chocolate or oily foods and stuff like that but it comes from your heritage its like if ur grandmother had pimples when she was young you unfourtunaly got them... that wat i heard also some say to be more healthy like drink alot of water and excersize and itll go away ...!