I agree with Dr Justin Boey who has answered your question comprehensively with regards to chemical peels for pores.
May I add on that daily use of a good toner appropriate for your skin type, certain lasers and Rejuran Healer can help to reduce pore size- extent of reduction differs from person to person. This is best assessed and consulted by a doctor with experience in Aesthetics/ Dermatology.
Hope this helps.
Cheers,
Dr David Deng