Itchy rash around eyes, mouth, and inner thighs

[badrash]

I have had a very red, itchy rash in various parts of my body for a month and a half, supposedly caused by an allergic reaction. The rash is around my eyes (upper and lower eyelids, extending to the brow ridge), around my mouth, under my left armpit, on my inner thighs, and on my left nipple. The rash is very red and has clearly defined borders. The rash oozes clear fluid and forms blisters. Sometimes the rash on my eyes is so swollen, I am unable to see and cannot drive to work. The rash around my mouth makes it so that when I open my mouth wide enough (to eat a sandwich or burger), the corners split open and bleed. I have been to 4 different allergists, and 2 different dermatologists, and nothing has been figured out other than that it is contact dermatitis. I have been on three rounds of prednisone, which eliminate the rash completely (but have very nasty side effects), have tried cortisone cream (did not work), and various other prescription-strength anti-itch cream (did not work). I have been on hydroxyzine, a prescription-strength antihistamine (did not work). I have eliminated all possible allergens that come into the contact with my body. I have stopped using deoderent, I switched to baby shampoo, I stopped using shaving cream, I switched to cetaphil (unsecented, hypoallergenic) body wash, and I have stopped using sunscreen. I stopped using fabric softener, I use ivory flakes laundry detergent, and have switched my bedding. I have even stayed at a different house for a week to see if the allergen was where I was living and the rash still got worse. I was blood-tested for various auto-immune diseases like lupus and the results came out negative. It seems like my doctors have all given up and want to put me on prednisone for the rest of my life to mask the symptoms but not try to figure out the problem.

[instantiations]

I had the same thing. My symptoms aren't completely gone, but i did do a few things that alleviated it:

-Switch toothpaste. Regular toothpaste has flouride and SLS which can be irritants. I use Jason Seafresh toothpaste and it specifically states No SLS and No Flouride.
-Are you a smoker? You will definitely need to quit as smoking has been found to cause skin problems of all sorts
-Only use organic items. if your soap, lotion, what have you state ingredients that you can't pronounce and sound like a chemical, stay away from it.
-wear breathable fabric. the summer made the allergy worsen in areas because i was fitted shirts and shorts. make sure to stay dry with organic baby powder.
-Aubrey organics makes a good face wash that i recommend using instead of regular face soap or organic body soap.
-definitely change your shampoo, maybe even conditioner [although i've been using a regular leave-in] because when you wash your hair all that product is getting on your body, too.

it's overwhelming but i found it helped a ton. I hope it helps you, too.