What’s red, rashy, and misunderstood? Eczema, which causes dry, itchy, inflamed skin. It affects nearly 32 million people in the United States–about 10% of the population–and even for people with a mild-to-moderate case, the condition can cause great distress. But dermatologists say that sufferers frequently make the wrong moves when it comes to prevention and treatment. “I’d say 75% of the people who come to me are using things I’d rather they didn’t use,” says dermatologist Ronald Davis, M.D., in San Antonio, TX. Here are some of the most common mistakes people make—and how to fix them.