All pores in the skin are open. Due to their appearance, large pores or visible pores are referred to as “open pores.” Pores can’t be closed. However, you can improve their appearance and make them less visible Pores can be caused by skin oils, elasticity, hair thickness , aging , sundamage and genetics. Hormones trigger the sebaceous glands, causing them to secrete more oil, which can make pores larger on the nose, forehead, and cheeks. Treatments available at Dr Kora Aesthetics for open pores