If she has had oral thrush recently then this is almost certainly a candida nappy rash.Use Nystatin cream applied after every nappy change which should be as often as you can manage so as not to leave a wet nappy in contact with this rash for too long.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.