[…] hypersensitivity reaction to a variety of agents, including drugs, arthropod bites, infections (bacterial, mycobacterial, viral, fungal, filarial), ingestion (blue cheese Penicillium
[dermpathdiagnostics.com]
Shelly 2 reported a similar case where lesions were due to hypersensitivity to penicillium mould of Blue Cheese.
[jpma.org.pk]
Erythema Annulare Centrifugum : A Case Due to Hypersensitivity to Blue Cheese Penicillium.
[jamanetwork.com]