Fucidin Ointment contains Sodium Fusidate which is a type of antibiotic. Fucidin ointment works by killing germs (bacteria) that cause infections. Fucidin ointment 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.