Any idea what this could be? Pics included

[onestepforwardtenstepsback]

Hi my ds has started coming out in these spots/rash.
I'm struggling to get a doctors appointment, waiting for a call back at minute.
There on his legs, arms chest and back.
Any ideas what it could be?

Has he has chicken pox? It looks like chicken pox before they blister up.

See that's what I thought but took him to doctors yesterday and they said allergic reaction. We've woke this morning and it's spread all down his back

Hives ?

It looks like a rash my dd has developed. Hers isn't chicken pix as she's had them and it looks different to when she had them, plus she's had it for a couple of weeks and it isn't getting any better nor any worse.

Have you been using any different washing powder/soap/shower gel lately? I changed washing powder a few weeks ago so I'm going to go back to the old one to see if that makes a difference.

Do they itch? could be hives. Or allergy. Piriton can help if they are irritating him.