What do I put on Allergy/Nappy rash? Due to pasta sauce?

[oasis]

My DD 2yrs and 4 months and still in nappies has a really red raw rash. Started on Sunday and the only thing we can figure may have caused it was a jar of pasta sauce, I know that tomatoes can be quite acidic could this be the cause?
What would you advise I put on it? She is in real pain when I wipe her, it really seems to sting. I do not want to put anything on that may cause her to sting even more. Should I just stick with Sudocream? Metanium any good?

hi id use metanium it works every time with my ds hope it glears up soon poor little mite

I used to swear by metanium when mine were in nappies, but be aware that it stains clothing.

As for the stinging just use plain water and gause,perhaps dry gently with a hairdryer (honestly!) let her have as much nappy free time as possible too.HTH

Thanks for advice, will get off to the chemist and buy some metanium.