Detailed answer

A rash is a broad term that refers to any change in the skin's appearance, such as redness, bumps, or inflammation. Contact dermatitis, on the other hand, is a specific type of rash that develops as a result of direct contact with an irritating or allergenic substance. It is a delayed hypersensitivity reaction that can occur after repeated exposure to the irritant or allergen. Common triggers for contact dermatitis include certain cosmetics, metals (like nickel), fragrances, and chemicals. The symptoms of contact dermatitis may include itching, redness, swelling, and fluid-filled blisters. It is important to identify and avoid the specific trigger to prevent future flare-ups of contact dermatitis.