My 5 year old son woke up itching this morning and I noticed this rash, my children haven’t had chickenpox yet so I’m wondering if this is the start of it or if it could be something else. It’s on his front and back and top of legs and arms. I know it’s so hard to tell. I thought it could be heat rash but it seems more spaced out than that. I would expect chickenpox to maybe look a bit redder though? TIA.