Chickenpox?

[Devonfirsttimemum93]

Looking for advice - my little boy has these red raised bumps all over his legs and arms. I assumed chickenpox but first noticed early this morning and they haven’t become blistered at all so not sure?

Looks more like an allergic reaction to me

^^not medical

This is what I’m starting to think, as I always thought chickenpox started on the torso first too. I don’t know anything he’s eaten or worn different but I’ve given an antihistamine so hoping they may disappear soon