I once had a face rash like that after eating chinese food from a new takeaway that had opened up locally. It cleared up with antihistamines which I always have in the house because I get hayfever and am prone to skin allergies as well, but if you haven't had an allergy problem before it would be best to see a doctor before self-medicating.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.