It sounds like some friction creating the rash, could it be anything to do with the diaper you are using are they disposable ones.,is she active in crawling round the floor on a carpet , do you allow her to be free of a diaper during the day could the skin in the area you describe be in contact with anything ?If the Doctor said it was a yeast infection then use the cream and it will go, I know sometimes if a baby is teething their urine seems to be stronger and diaper rashes do appear .. good luck they all get rashes at some time ..
It's likely something she is eating. I'm having similar issues with my baby, she never had a single rash until introducing table food. I would suggest lots of air time, and when her rash is clear, use vaseline after each change to keep the moisture off of her. Also, Sudocream is the best diaper rash cream I have used. She may need some hydrocortisone cream to treat the inflammation, but this should be used sparingly and not long term, as it can thin the skin. It's something the doctor can prescribe in addition to the yeast cream.
Don't use anything in the bath except warm water, and use a very mild soap at the end of the bath for washing and shampooing. It's relatively common, so I wouldn't worry too much.
Well she's been using the Pampers cruisers since she was born and i love those, she never got a rash with them. Then at around the time her rash broke (i think that same day), i had bought pampers sensitive just to try but ironically - they don't seem to be sensitive or soft, they have this separate layer on top that has holes and i dont know if that maybe triggered it or irritated her skin because with every diaper change, that layer would stick to her skin kind of. But it's hard to believe it's from that because I stopped using those diapers a week later because I thought it might not be for that and it might have been food (some kind of lentils soup i made with veggies), but everything i read indicated that lentils does not usually cause any allergic reaction in babies. She didn't break out with a rash for any other food, so I didn't think it would be that. I stopped giving her that food just to try it out and I stopped using those diapers, but the rash was still there. I continued with the prescribed cream and it went away a whole month later, which was odd it took so long. But it still creeps up when she goes poop. She has been crawling since 7 months, so I'm not sure if it has anything to do with the carpet. I never let her be free of a diaper during day. I'm going to have to try that so she gets air time. Oh and thanks for suggesting Sudocream, I'll have to buy some. Thank you both for the replies. :)