My little one comes up in this hive looking things every now and again. She's only on formula at the moment so not a good allergy. She has a chest infection and I have read that hives can me linked to infections. Have anyone had/seen similar? Once they are appear they grow in size then disappear within ten minutes or so. I'm trying not to worry as they don't seem to bother her but they look so angry. Pic with the small hive is when it first appeared and second is 6 minutes later.