It does sound like some type of allergic reaction.
Did you change soaps? Eat some thing you normally wouldn't?
A really soothing face mask safe for pregnancy and great for pimples is :
A paste made of honey, oat meal, and a little bit of lemon juice. Oatmeal is so very good for dry skin and so healthy for skin, honey has natural anti bacterial properties (which is great BC pimples are bacteria) and lemon is an awesome exfoliant it takes off the dry dead skin without being harsh or damaging.
If you take a benadryl and the symptoms don't go away then its not an allergic reaction.
Try the mask 2 times a day for a week and you should see a huge difference. That mask is a life saver.
(just do what i do and make a big jar of it so you don't have to keep making more every time you want to use it)
And if you have dark circles under your eyes you can add a table spoon of fresh ground coffee (not coffee beans, already ground up coffee)
I haven't heard of that. I would call your nurse line. It could be nothing, but maybe it's a rash or something you're allergic to. They could help you figure that out