I am new to the list.Have had mild rash for 10 years and now for 6 months have chronic urticaria.Have been to dermatilogist ,tried all the meds. mentioned to no avail.Now on Doxepin which helped for a few weeks,but came back with a vengeance last week.Salt baths help,and vinegar dabbed on helps for a while.Getting desperate now,so am getting a hair sample done as it is supposed to show up any defficiancies.But have to wait in line to see the doc.as she is booked up for 2 months.