From Flawless Complexion:
Large pores are simply a genetic problem, but you can temporarily reduce large pores by clearing away dirt and debris. Large pores are often an indication of oily skin. Use one after the other for cleansing and exfoliating the skin. Mix 2 egg whites with a few drops of lemon juice. Apply on face and leave on for 5-7 minutes, then rinse with hands. As egg whites dry, they linghten the skin and pull debris out of pores. This version is the first release on CNET Download.com.