Fucidin H cream is a skin cream that is most commonly used to treat infected eczema and other infected skin conditions. The medication contains two vital ingredients: hydrocortisone and fusidic acid. Fusidic acid is an antibiotic. This means it kills bacteria and germs that cause infection on the skin. Hydrocortisone is a corticosteroid. As such, it reduces swelling, redness, and itchiness of your skin. Together, hydrocortisone and fusidic acid provide an effective treatment for skin conditions that cause inflammation and infection.