Hi J.,
Congrads on your pregnancy. I really don't know anything about puppps, but I did some research on the net. One thing that you will be happy with.... it ususally only occurs during the first pregnancy not w/ susequent pregnancies.
Now about the cold sore..... unless you have type 2 herpes (vaginal) you probably have nothing to worry about. The virus she was talking about is the herpes virus. There are about 8 different strains. If you have vaginal herpes, than you should deliver the baby by c-section. Other than that, just don't kiss your newborn on the lips, after you deliver. This could cause a transmission of the virus, which can be deadly for infants under 9 months of age.....thus the c-section.
I feel for you because I suffered from urticaria for over 4 years. It was nerves, it was allergies, it was an autoimmune thing, my clothes were too tight, I exercised too hard (HA!)The sun caused it. Never really got any true answers. However, fexofenadine or allegra 180 was the only medication that keeps my hives at bay. I now only suffer from them when I am sick, or surgery, the flu, you know when my body is under extra stress. This is also a cause and effect for the cold sores.
Good luck! You may want to check w/ OBGYN if allegra is safe to take w/ pregnancy. Though your hives should not reappear, atleast if they do, then maybe the allegra will help you too. Never take anything during pregnancy w/out checking w/ OBGYN first.
Good Luck!
H. B.