Is this heat rash...? Pic included

[Goostacean]

DS, 16mo, keeps coming up with this type of mark which does then fade quite quickly. Sometimes it's separate, like bites. This evening it was all together as shown. Any thoughts?

Classic looking hives

Hives, she's possibly allergic to something.DS3 came out in hives at that age after having some Nurofen.

Noooo. You're right! Thank you, good to know. How weird... they don't seem to bother him at all. Argh, what a nightmare. GP for antihistamines...?

You can buy piriton from the pharmacy. I would do that and just see if you can link it to anything. If not it could just be idiopathic and he will grow out of it.

Obviously if he gets them on his lips or tongue then you'd need to see a dr but otherwise there isn't much they can do at this point

It seems to be starting when he's very sweaty in bed, so we've got him a nice cotton pillow and are dressing him more lightly. But that photo was taken at 7pm after his bath, and he woke from his around 1430