allergies
"I am highly allergic to...oregano!  Sounds strange - but true.  I will develop blisters on my lips where the oregano touched.  It started when I was cooking spaghetti in a friend's kitchen.  Going through the spice cabinet, I found powered oregano.  I smelled it and found it smelled so good, that I kept smelling it from it's container as I cooked.  The next morning the end of my nose, around both nostrils, and my lips were covered with blisters!

  Before doing this, I had no allergy to oregano!  (so don't do this!)  Now, when I feel a blister beginning to form on my lips, I have to take fast action.  Atarax works well and quickly...which is what I need in order to stop the reaction."