For a child with the scarlet fever rash, gentle remedies like calamine lotion, oatmeal baths, and doctor-approved antihistamines can help ease itching and discomfort. It’s best to use mild, fragrance-free products and avoid anything harsh on the skin. Remedies to avoid include steroid creams, strong essential oils, or home treatments with chemicals, as these can irritate the rash or trigger allergic reactions. The priority is to keep the skin clean, comfortable, and let the antibiotics treat the underlying infection.