I noticed a spot on DD's back yesterday lunchtime, but as it was one on it's own I thought it might be a bite or something... Anyway, last night at bedtime I noticed about 7-8 more, mainly on her arms and legs. They feel raised and look like they have, or are developing a head.
I put her to bed expecting her to wake up covered, but she only has the same amount as she went to bed with 
She has been very snotty for a couple of days with a bit of a cough, but no temp that I have noticed...
I am worried as I have never had it!