Several factors contribute to the dilation of pores. One of the primary reasons is the overproduction of sebum (oil) by the sebaceous glands, often influenced by hormonal changes, which can cause pores to expand. Aging also plays a role as the skin loses its elasticity, making pores appear larger. Other contributing factors include genetics, prolonged sun exposure leading to skin thickening and damage, and improper skincare, such as inadequate cleansing that leads to clogging and stretching of pores.