Talk to Dermatologist on Face Acne Problem

Asalam O Alaikum Mam/Sir I had a lot of pimples on my face for the last three to four years but now I am much better than that but still i have a new acne on my face every day and there are a lot of marks and scars and my forehead has come out and now I have stopped eating fast food completely for the last three to four years but whenever I eat something outside or drink colddrink Or if I eat a chilli or something oily, I immediately see grains on my face the next day. I'm very upset with this problem. Please some one tell me a good solution Thank you