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.
how long does rash from strep throat last. my son is 10 months old diagnosed with thrush was given nystatin. rash developed and seems to have worsen with nystatin. taken to pediatritian again and son rediagnosed with strep. said rash developed from strep. concern i have is if rash developed from nystatin or strep. if it is from step how long does it usually last?