Question: how do you know if you're allergic to fabric softener?
Answer: Allergic contact dermatitis. This also appears as a red, itchy rash, but usually not with immediate contact. If your child has a true allergy to laundry detergent or fabric softener, you may not notice redness or itching for up to a week. “It can take the immune system a while to identify allergens,” says Dr. Tamburro.