there are covers for fent they are askina derm the kind they put over your iv first shave arm really good and big take shower and scrub the hell out of the area when its patch day then put fent on then the derm over it as long as you do it right and get the derm over the patch and flat not screwed with wrinkles and crap i take at least two showers before derm starts to peal a little and is not safe for any more showers but you have to dry derm really good after the shower it will start to peel as long as its a small peel take another shower its commen sense to know when not to risk a shower with it the number is 1-800-796-9526 and you will need the very hard to read info on the bottom of the fent box lot number etc then once you get a pack it has a form so you dont have to call unless form is missing good luck