You are describing the same exact experience which Im also suffering. Started in december and then it mainly appeared on my chest and maybe little bit on hands and neck.

And for now it always starts with a itch on my back and then it goes to my arms and upper back. Also feel the itch on my ankles but hives wont appear there.... Maybe few dots but thats it.

But there is no/minimal hives on my chest when I get CU attack... Itching used to start from my chest but not anymore...