Welcome to HCM. Red blisters with itching indicates some allergic reaction and you have to judge the triggering factor. It might be allergic reaction due to fabric softener,avoid it s use. You have to start levocetrizine with mild steroid to subside the allergic reaction. It will subside within 3 to 5 days. Local application of calamine,alovera lotion will give cooling effect. Get examined by dermatologist for proper diagnosis and medical management.