Hi. My guess would be bacteria / Yeast / Thrush. We had loads of problems. The issue is that all these nasty's build up with the creams in the nappy area. We found cleaning with cotton wool balls and warm water helped alot instead of wipes and creams. If this is the case, it will get better. However you should see your pediatric consultant locally to confirm. Also If you are being looked after at GOSH as we are your Derm Consultantant will respond if you contact their PA by fax or email. Hope this helps but please let me know. Many thanks.