Food Allergies Treatment

My daughter just turned 1 and has been on alimentum, a hypo allergenic formula. We tried whole milk and she got a rash around her mouth instantly, then we have had her on soy for about 3 days now and she seems to be getting a light rash on her body.

She currently does have her first diaper rash ever, well i thought it was a diaper rash and the MD said it may be yeast so we are using some rx to clear it up.

I dont know if it is that rash or the soy. I am so sick of guessing so I made an appt with the allergist and I am going to have her tested to just “KNOW” if she has an allergy and then go from there.

Can anyone tell me what to expect? I know its the skin prick test on her back, will this hurt bad? I had a big one done when i was a kid in school, but NOT a baby…

Would love some personal advise or stories..

Thank you

She is 3. She has severe skin reaction to egg white and suspected intolerance to wheat. She had eczema as a baby but we took her off milk and it cleared up. My GP was difficult in prescribing soya formula for her but eventually gave in.
Me and my partner have reasons for refusing to have her tested at the local NHS hospital.
We looked into going private for allergy testing and found a pediatric allergy specialist in south east London. They said i needed a referal from my GP even if i get the testing done privately.
My GP refuses to refer her saying we should use the local NHS hospital.
What can i do … where do we go from here?
I can not change GP’s since they are all pretty useless in my town and the only ones that aren’t are not taking on new patients. (My last GP was brilliant but he retired from the NHS to join the police service :~(

I found out a bit ago that I am allergic to milk through a blood test. I was curious if anyone knew if you can be tested for the individual proteins in milk to narrow it down? I.e. can you be tested for a specific allergy to casine or whey or is it just milk in general only?