She's just gone back to bed after waking an hour ago crying. I've had a look and she does look a bit red and swollen but there's no injury that I can see. I've asked if it hurts when she wees but she says no, it just stings and hurts all the time, she keeps scratching. :(
She has to wear pyjama pants at night because she wets so I wonder if this could be causing the problem. I've just let her go to bed with pants on so that she's more comfortable.
I'm going to get her into the doctors asap, but does anyone know what could be causing this?