question: my 13 month old has ulcers on her tongue red swollen gums very tired fever highest 105.5 had a fever for 5 days. greyish coating noted on some teeth. went to doctor and was diagnosed with croup but I doubt it now. these symptoms did not come about until the next morning.  What could this be?  She was playing with toys at the dentist office the day before and I think she picked up something there. I am taking her back to the doc in the morning.