 [ Symptoms ] has gallbladder removed er surgery for herniated and obstructed intestine and a gastric bypass hands now blue [ Disease ] 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