If you find yourself red-faced after running, you’re not alone—this is a common occurrence, especially among women and individuals with fair skin. During a run, your body generates heat, and sweating is one way it cools down. In addition to sweating, your body increases blood flow to the skin to help regulate its temperature. To do this, the capillaries in your skin dilate, allowing more blood to flow through and release excess heat. This natural response can be more noticeable in those with sensitive or fair skin, as their blood vessels tend to be closer to the surface. Factors like hot weather, humidity, or intense exercise can also intensify facial redness.