I always get lots of pimples in my face,what should I do?

I always get lots of pimples in my face,what should I do?
I get lots of pimples and I saw the doctor,the doctor said I should eat less junk food and irritant food,I did it,but my faces still get pimples,the situation hasn't improved,what should I do?
I can't get up early bacause of study,and I have too much homework to do,could you give me some advice?