Food allergy?

Most of the time Elise has diarrhea, because of this she always has a red and painful bottom. I have no idea why she never has a normal poop. I give her Lactaid because regular milk was giving her horrible diarrhea but that didn't seem to change much. How can I know what's causing it? has anyone done a food allergy test?

00
07/04/15
I will ask but doctors never want to do what parents ask. They think they know everything.
0
    07/05/15
    Comment deleted
    07/05/15
    I saw a video of an allergy testing being done on a toddler and it looked painful! :( I really don't know what could be causing it. She barely eats only a few things like potatoes, eggs she loves eggs (I haven't seen any allergy reaction on her). some meats and cereal, and lactaid milk. I will check what other milks I can try besides cows.
    0
    07/05/15
    Comment deleted
    07/05/15
    I tried unsweetened almond milk she did not like it much. I never bought it before so I guess they have the sweet one as well? No she only drinks water, rarely some apple juice.
    1