A rash, or dermatitis, is an area of irritated or swollen skin. It can be itchy, red, and painful. Learn about the types, causes, and treatments. Rapid spreading or all-over-body rashes can mean drug allergies or an infection like measles. If breathing problems happen with a sudden rash, it could be a severe allergic reaction. Rashes that last for a few hours or days in adults usually aren't anything to worry about. Rashes are unusual changes in skin color or texture. They normally come from skin inflammation, which can have different causes. There are many types of rashes, including those caused by skin. Skin rashes can be red, inflamed, bumpy as well as dry, itchy or painful. The main cause is dermatitis, which is when your skin reacts to allergens or irritants. Bacteria, viruses, allergens and conditions including eczema, hives, and psoriasis can be the source of skin rashes. Rashes may be itchy and painful and appear differently on different skin tones. In some cases, a rash may be a sign of a medical emergency. Rashes have a variety of causes, from bug bites to. Different rashes can appear and feel differently, so it’s important to get an accurate diagnosis. Different kinds of skin rashes include eczema, chickenpox, psoriasis, and shingles. Treatment. A rash is an area of skin that is irritated, inflamed or swollen. Rashes can occur due to various causes. Discover 36 common skin rashes. Rashes can happen for many reasons, including skin infections, allergies, and medications. They can also result from bacterial, fungal, viral, or parasitic infections and other diseases. In this. A rash may be localized in one part of the body, or affect all the skin. Rashes may cause the skin to change color, itch, become warm, bumpy, chapped, dry, cracked or blistered, swell, and may be painful. While you’re waiting to be seen, check out these photos of common skin rashes and the symptoms that usually come with them to get a better idea of what might be behind your bumps.