Rashes (dermatitis) have many causes including allergies, friction, prolonged exposure to heat or moisture, or contact with irritants such as chemicals.  Allergic contact dermatitis causes itching and blistering and is commonly caused by nickel (used in jewelry), preservatives, fragrances, and poison ivy and other plants.  Eczema or atopic dermatitis is described as the “itch that rashes” with patches of dry red skin with scales that sometimes becomes infected.  This rash occurs on the face, neck, and creases of the elbows, knees, and ankles.  Effective treatment includes proper skin care, avoidance of triggering agents, and medications and may require the input of a dermatologist for the most accurate and effective treatment.