My DS get really horrific nappy rash when he is teething too. And its so distressing for him and us when changing his nappy when he has it. We've tried a couple of things that have worked but might need to come back on tomorrow with some of the exact names as their in the change table drawers in his room and he's asleep.

When it gone on for a few days I've treated it like there is a fungal infection there (pharmacist put me onto this). Will check spelling for you but its called Daktozin. Use this plus barrier cream and it will clear up. When its really bad like this I use Burts Bees barrier cream rather than just normal one. Other thing I do when its very bad as he crys and screams when you are trying to clean it is use a soap replacement cream (one I use is called Acueous made by Kenkay but there are probably generic brands also) and I use these wipes call Pure Wipes to remove the cream. These little wipes are so good. They are completely pure nothing added to them. They come in little tablet form - like the size of a lozenge and you just run water over them and they expand into a wipe. You simply put the aqueous over the bottom (uncleaned so poo and all) and then use the wipe to remove it. There is no stinging or anything in the cleaning process which makes is to much easier got everyone.

Google Pure Wipes and you should find their website which details they stockists - I've never seen them in normal chemists or supermarkets. PM me for link if you can't find it.

HTH and hope it all gets better soon.