Understanding Skin Rashes: What’s Your Skin Trying to Tell You? Your skin is your body’s largest organ and sometimes, it’s the first to warn you that something’s not right. Here’s a quick look at four common types of rashes and what causes them. - Hives (Urticaria): Triggered by allergic reactions to foods, insect bites, or stress. Appears as raised, itchy welts that can change shape and location rapidly. - Eczema (Atopic Dermatitis): A chronic inflammatory condition often linked to genetics and