How can I get tightened pores, and what should be the frequency of treatment?

Doctor's Answer

Those lasers are good to reduce the appearance of large pores.

If you have acne scars and can afford downtime,

Fractional CO2
Erbium:Yag
Erbium:Glass
Thulium
Fractional picosecond lasers can kill 2 birds with one stone

If your pores are not too bad and you cannot afford downtime, a carbon laser peel (Q-switch ND:Yag laser) with proper skincare might just do the job. However, repeated treatment is needed to achieve optimal result.