The problem of enlarged pores on face or facial pores is commonly associated with excessive oiliness and acne. The excessive oiliness of the skin is in turn triggered by the hormonal changes in the body.
Large pores can be easily dealt with proper cleansing and frequent toning and moisturizing of the skin. Clean your face with a mild face wash like Cetaphil and after a non alcohol based toner, apply a mild non perfumed, non greasy moisturizer. Other treatments to consider include microdermabrasion, skin resurfacing lasers and chemical skin peels.
In my opinion you should discuss these treatment options with a cosmetologist/dermatologist.
I hope that helps. Take care and please do keep me posted in case you have any additional doubts. Kind regards.