The main causes of large pores include excessive sebaceous gland secretion, skin laxity and aging. 1. Excessive secretion of sebaceous glands: Due to excessive secretion of sebaceous glands, there is an imbalance of oil and water in the skin and oil accumulates in the pores, thus making the pores bigger and bigger, which are mostly found in the forehead, nose and the periphery of the nose. 2. Skin relaxation and aging: with age, the face of the collagen will gradually lose, it is difficult to support the pores, when the support around the pores is not enough, the pores will relax, and gradually become larger, deformation. Daily life should pay attention to regular cleaning of the face, if the skin pores are more serious impact on the aesthetic, you can go to the regular hospital dermatology consultation, under the guidance of the physician for treatment.