 [ Symptoms ] what illnesses often co exist with bipolar disorder [ Disease ] the rash from strep is called scarletina or scarlet fever it would be very uncommon in a ten month old and i would definitely confirm this with a culture this type of rash is bright red covers the entire body and the child is very very ill later this rash will peel like a sunburn and can last a week or more i have no way to examine your child over the internet but i would question the diagnosis thrush is yeast not a bacteria and it does not cause a general skin rash other than a diaper rash the drug nystatin is unlikely to cause a rash