If the wall of the pore breaks, it can become inflamed and red. If it breaks further below the skin's surface acne nodules or cysts can form. It is important to get these treated, unless of course you want permanent scars. Chocolate doesn't cause acne. Professional dermatologists no longer link acne with diet.
Clean people get zits too.
You should only wash your face gently with a mild cleanser no more than twice a day.