Contact dermatitis is a rash that is caused by an allergic reaction to something that is making contact with your skin. It is often red and itchy. Although this type of rash is not contagious or concerning for your health, it can be a nuisance and uncomfortable. While the cause of contact dermatitis varies from person to person depending on the material coming into contact with an individual’s skin, some common causes are cosmetic products, cleansers or detergents, jewelry, or plants. Some areas commonly affected by this type of rash include the wrists (if caused by jewelry or a watch), or a leg that came into direct contact with a plant such as poison ivy.