Hello,
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. 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. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
If the acne scars are fairly new, then aloe vera applied during your nighttime facial regimen will help reduce the acne scarring redness of the spots over a few weeks. At age 21, this should be a good treatment. For quicker results (and little more expensive), salicylic acid peels and microdermabrasion treatments done by an aesthetician or a dermatologist will also help reducing scar tissue by removing the top layer(s) of skin - there's a noticeable difference after 2-3 treatments. Aloe vera and other quality moisturizers are a good follow-up to these treatments. Deep-set acne scar tissue will most likely need to be treated by a dermatologist with laser or special light therapy. Good luck!