Hi.. I am 36 years old and I have problem from last three months that pop up red bump on all over the body and itchy lot. After itchy it turn hard red skin. I changed three dermatology and rehumatology, but they could not figure it out why I have rash. Because my blood report are normal. Then I notice when I eat mango, orange, yogart it's terrable red bump and lemon kill mr. I am taking medicine xyzal but does not help me. So please advise because even I eat little shore food or bagle, it horrable and me me up set. Please advise me what to do.

Didn't the dermatologist check for allergies with something other than a blood test?

Don't know if it will help, but check this site under Home & Garden/Pest Control and 2 questions on 'invisible biting bugs.' See if any of those symptoms sound familiar.