Highly acidic fruits will cause mouth rashes. It often has nothing to do with allergies. Its a sign that her body is not ready for that food just yet.

Wait a few months and try a small amount then. Most often than not, this is outgrown. When testing for allergies, keep an eye out for any swelling or extreme itchiness, particularly around the face- that is a sign of anaphylaxis; a severe allergic reaction. If that happens or your child is having trouble breathing or is wheezing, get to the ER asap.

My daughter had trouble with tomatoes. She still can only have them in small amounts.

I agree that foods that are high in acid can cause this kind of thing. i would also say that kiwi tends to be "one of those foods" that are more common for food allergies. If it were my child I'd take her in so I think you're doing the right thing. I'd probably take a picture, too just in case it starts to go away- becuase if it is an allergy and it's gone when you take her in you'd never really know.
Good luck! Glad it's just a rash and nothing too extreme (like lack of breathing!)

When she woke up this morning, after the worst night we have had in a long time, it was gone. So I called the doc and he told me that unless it comes back not to worry about bringing her in, and to maybe steer clear of kiwi and try it again in a few more months. I figure I'll try it again the day of her one year check up. That way if it happens I'll be at the docs!
But now I'm worried to try her on anything else with a little more acidity. When should I try her on things like pineapple? Oranges? If the kiwi was what made her legs and back break out then would those have an effect too?
There is always something with this kiddo to keep me on my toes! We just got over her fourth ear infection in the past two months and now the rash!

Random thought....she is allergic to cefprozil, broke out in hives and had trouble breathing. So she keeps getting amoxocillan(sp) and has basically been on it for like two months straight. It doesn't seem to be the most effective medication. Could she get a rash from the meds being in her system so long? Seems like a stupid question, but I guess the best way to find out if I'm waaayyy off base is to ask.

Interestingly, I work alot with penicillin/amox. for my job and I don't think you can get a rash from being on it too long. If anything it would lose its effectiveness. That being said, my daughter had 4 ear infections if 4 months and the doc moved her to something a little stronger than amox.

Back to the rash... I don't think I'd hesitate to try different things, but that's just me. I might wait a few days until everything is out of her system but then I'd do a little at a time. I hope it works out for her!

Everyone is right - acidic foods can cause rashes. They generally say to stay away from them until your child is about a year old. My son, currently 17 months, continues to have a citrus intolerance, and also has a similar reaction to tomato-based products. His rash generally shows up in his diaper area, though. Not harmful, but probably not comfortable, either.

My best suggestion is stay away from those foods and try them every couple of months.