What is this rash?

[Ladybug1897]

Ds woke up with this rash Monday morning and since then it's faded and come back worse and is changing by the hour.
We've already been to the pharmacy and they just gave us piriton which hasn't helped after 24 hours.

He has no other symptoms no fever or anything just slightly itchy.
Does anyone have any ideas what this could be?
Thanks!

Need photo?
But if you've been to the pharmacy and they gave piriton did they look at the rash? Is it hives? Sounds like it from your description of the changing. If so sometimes they just take a couple of days to disappear. Go back to the pharmacy if you are worried.

Photo should of uploaded now! Forgot to say it's on his face.
I've booked a doctors appointment for Thursday I just thought if it was a reaction to something it would of gone down by now

Another photo. Its just such a weird shape. Yesterday it was a long line going down his face next to his ear. Now it's further along closer to his eye.

Might be parvovirus - slapped cheek.

Has he recently had a cold/virus? That can cause all manner of post-viral rashes, including hives, and isn't an allergic reaction.
But you have a doctor's appointment anyway so it's fine (although I expect it will be gone by then)!