Corticosteroids come in different forms, including inhalers, nasal sprays, injections, tablets, liquid, and topical creams or ointments. Their main use is to reduce inflammation, especially when the body mistakenly triggers inflammation where it shouldn’t exist, such as the kind caused by asthma, allergies, or autoimmune diseases. During an allergic reaction, for example, the body may regard a certain substance as harmful and trigger an inflammatory reaction. Corticosteroids block the chemicals the body uses to start the inflammation process. For allergic skin conditions like eczema, creams or ointments applied directly to the skin can calm an inflamed area. For allergies like hay fever, steroid nose sprays can offer your child much-needed relief.