My child (2yrs 9mths) have developed some small red spots on her front - about 4 on her chest / belly and one on her neck . Some of them are very small, and the largest one is about the size of a teenager pimple . Not sure if they hurt, but she scratched the largest one, and it burst, though no puzz came out. She is under the weather, with a mild chesty cough. Her appetite appears to be unaffected. Should we be of concern?