Most open or enlarged pores are caused by age, sun damage, genetics or oily skin. Some acne scars can also appear as widened pores.
Usually an excess production of oil or sebum combined with clogged pores results in enlarged pores.
Maintaining a good skincare regimen, a healthy diet and keeping your skin protected from the sun can help in having a healthier looking skin. Some treatments such as intense pulsed light and Matrix RF may also be useful.