Metanium nappy rash ointment is an ointment for topical application which is used to treat nappy rash rubs easily into the skin after removing the soiled nappy clean and wash the affected area drying with a soft towel wash your hands and dab a small amount of ointment over the sore area with your fingetip spread the ointment thinly so that the skin texture can be clearly seen through it repeat at each nappy change to treat nappy rash