Fifth Disease, also known as erythema infectiosum, is a viral infection that causes a rash on the face and body. While there are no antonyms for the term "Fifth Disease," there are several conditions that are not associated with it. These include diseases such as chickenpox, measles, shingles, and roseola. Unlike Fifth Disease, chickenpox causes itchy blisters all over the body, while shingles causes a painful rash on one side of the body. Measles is another viral infection that causes a very distinct rash, usually affecting the face and neck. Roseola, or sixth disease, is another viral infection that produces a rash on the chest, back, and stomach.