I've never had it but my DD is very very red and sore around her vagina and anus, she said it had been itchy before the stinging begun. It stings to wee as well.
I'm thinking nappy cream but this is the second time it's happened in a month.
She's ever so fair skinned with auburn hair. So she has very sensitive skin 
How can I help her and stop this happening? Nappy cream or something else?