It sounds like it could possibly be hives which can be caused by many factors including:


-Allergens, including food
-Environmental factors; such as pollen, dust, and change in temperature
-Emotional factors; such as stress, anxiety, etc.
-Drugs; such as antibiotics, anti-inflammatory, and vaccinations
-Synthetic products; such as deodorant, perfume, and other synthetic substances
-Infections and infestation from fungi, bacteria, viruses, pets and insects

Start keeping track if there's anything different that you've added to your diet, laundry, cleaning supplies and things like that. Are you under a great deal of stress? I used to break out years ago when I was going through a very stressful time, since I'm no longer in that work enviornment I haven't had any break outs. I hope this helps and keep us posted of how things turn out.