There is a certain satisfaction that comes after powering through a tough HIIT session. You expect that fresh, healthy glow at the end, but some people instead end up with a face that looks bright red, which can make them feel uneasy once they leave the gym.To help you get back to your favourite spin class or running route without second thoughts, we turned to dermatologists to understand why this happens and how to calm it down. Here is what actually causes that red flush after exercise and what you can do to manage it.Why Is My Face Turning Red After Doing Workout?Your face often reddens during a workout because your body sends more blood to the skin and your temperature rises. The blood vessels on your face open wider to help release heat. It is simply your body cooling itself while supplying oxygen to the muscles that are working.Vascular Changes Cause FlushingThe encouraging part is that a flushed face after working out is usually a normal part of how the body reacts to exertion. As your temperature rises, sweat helps cool you down, but your body also shifts blood flow and widens vessels near the surface of the skin. This can show up as a red or flushed look. Blair Murphy, MD, FAAD, a board-certified dermatologist in New York City, explains that this post-workout redness happens because the small blood vessels in the facial skin open up. The face tends to show it more clearly because it has many surface-level blood vessels.People Prone To Flushing May Have More Superficial CapillariesThis kind of flushing appears in certain people simply because they have a greater number of capillaries near the surface. During exercise, your heart pumps faster to carry more oxygen to the muscles. The capillaries expand to move that oxygen efficiently while also carrying heat outward to help regulate temperature. Your overall fitness level may also play a role. As blood flow increases, skin cells can release different substances in different individuals. Some may release prostaglandins, which add to the redness, while others may release histamines, which can also trigger flushing.Flushing May Be More Noticeable In Fair Skin TonesAccording to Arash Akhavan, MD, FAAD, a board-certified dermatologist in New York City, everyone experiences flushing during exercise, but it is more visible in people with lighter skin because deeper pigment in darker skin tones can hide mild redness. He also notes that some people naturally have a more extensive network of tiny blood vessels, making their skin appear redder after exertion.How To Prevent Facial Flushing?Opt for lightweight clothing: You cannot completely stop redness during exercise, but you can take simple steps to reduce it. Try working out in a cooler setting and wear loose, light-coloured clothing to help your body regulate heat.Avoid alcohol and excessive sun exposure: If your skin already flushes easily, alcohol before a workout is not a good idea. Corey L. Hartman, MD, board-certified dermatologist and founder of Skin Wellness Dermatology, explains that alcohol widens blood vessels and increases facial redness. Too much sun can also irritate the skin and make surface capillaries more visible by causing them to dilate.Stay away from potentially irritating skincare: Those who flush often or have rosacea should avoid skincare that can irritate the skin further, including alcohol-heavy products, highly acidic creams, or strong retinoids. Dr. Akhavan recommends choosing calming, non-irritating products with ingredients like hyaluronic acid, vitamin C, and niacinamide. Vitamin C is especially helpful because it protects the skin from oxidative stress and helps shield against UVA and UVB rays, which can intensify redness. Fragrance should also be avoided since it can trigger irritation and increase flushing.