Does microneedling help with large pores? To reduce the size? And will it effect filler I currently have in cheeks?

Thank you for your question. Yes, microneedling does help fill large pores. I would advise you to schedule a consultation with a board certified plastic surgeon for a detailed examination to discuss all possible treatment options and what your expectations are. 

I have been performing medical microneedling for over two decades now. Despite claims that it is effective as a monotherapy for acne scarring and for treating ice pick scars and enlarged (dilated) pores, I have found it to be best reserved for treating residual surface color and textural irregularities that persist following other, more appropriate treatments for the foregoing problems. In my experience, dilated pores, much like ice pick scars, respond better to TCA CROSS. Following this, if still deemed necessary or desired, medical microneedling may be used to blend the treated sites better with the surrounding normal skin.  Other treatments, such as bells and whistles fraxels and radiofrequency devices simply add to the expense, and to date, the claims for their efficacy remain largely backed by device manufacturer supported marketing hype and little hard science. Hope this helps. Best of luck.