 [ Symptoms ] i have a hot itchy rash that occurs at night in bed it mostly clears up after a shower how do i get rid of this rash [ Disease ] you must first identify the cause not something that i can do for you over the internet one possible culprit would be enzymatic detergents like tide or perfumed dryer soften sheets bounce etc  that cause a contact dermatitis of course there can be many other considerations until you figure it out re wash your sheets in a milder detergent and do not use a softener take a long acting antihistamine at bedtime