Rash From Plants. Contact with the oily coating from poison ivy, oak, or sumac causes a rash in many people. It begins with redness and swelling at the site, and then becomes itchy. Blisters usually show up within hours after you touch the plant. A typical rash looks like a red line, the result of the plant dragging across your skin..In general, a rash is defined as a change in your skin's color or texture that is different from normal [source: WebMD]. When you spot a rash, you probably wonder where it .Skin rashes can occur from a variety of factors, including infections, heat, allergens, immune system disorders and medications. One of the most common skin disorders .Skin rashes can be both unsightly and uncomfortable. Some are caused by minor irritations or allergies, while others are related to more serious infections. We'll help you identify different rashes, tell you about some possible causes for rashes in children ands, and explain how rashes can be treated..
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Most people are sensitive to the oil in poison oak, which the plant will release when damaged in any way. Usually, an itchy red rash will appear that can take four weeks to .