What does a fooofd allergy rash look like?

[Wahtstherash]

Would it only be around the mouth?
Dd is 11 months and developed a weird rash on her arm during her afternoon nap yesterday. It is now almost faded but hopefully you can still get an idea of how it looked from the pic. There were some bigger spots with lots of tiny pinprick ones inbetween.

It only just occurred to me I had given her prawns for the first time for her lunch.

Could it be that? Do I need to be careful with shellfish going forward?

The title should say food allergy!

As far as I know from doctors questioning me about my DC’s allergies to food the rash can appear anywhere. I would definitely be careful with shellfish from now on and I’d ask the GP for skin prick allergy testing. They may say no though as the rash could’ve been caused by something else.