you most likely have hives (urticaria). this can be causes by hundreds of different things so it would not be possible for me to determine the one or many causes. soaps detergents dryer softener sheets foods medications and hundreds of other things may be the culprit. assuming you can take an antihistamine (claritin zyrtec allegra or benadryl) this may helpful at bedtime to see if this can be prevented otherwise you may need to see your medical provider.
i have a rash/welts that wake me up @ 2 am every day. what could it be? . they're located on my butt abdomen and trunk area. they disappear and reappear as stated above.