Fucidic acid cream 15g contains Fusidic acid which is a type of antibiotic. Fucidin cream works by killing germs (bacteria) that cause infections. Fucidin cream is used to treat conditions where the skin is infected by germs (bacteria), such as: Impetigo (a weeping, crusty and swollen patch of skin), infected dermatitis (inflammation of the skin) and spots, infected cuts and grazes.