Eczema is a group of skin conditions that causes red, itchy rashes that affects up to 20% of infants and about 3% of adults and children. To help prevent an eczema flare-up, WebMD recommends the following: moisturize your skin frequently, avoid sudden changes in temperature and humidity, avoid sweating or getting too hot, manage stress, avoid scratchy materials, identify and avoid foods that trigger symptoms, and use a humidifier in your house. WebMD, July 2021