Spots or no spots

We found out today that Eden has chickenpox. Not great timing when we're going on a family holiday with the Foreveryoungs soon to meet up with my cousin (who lives in Australia) in Thailand!

As Ethan has never had chickenpox before either we're worried he's going to now catch it too. He has these small marks on his back but not sure if they're "just spots" or the start of something else!