24 y/o f with rash(no itch) and nausea. No fever, no GI issu | Figure 1

Case Description

24 y/o f with rash(no itch) and nausea. No fever, no GI issues. Treated as allergic reaction with 50mg Benadryl and 4mg Zofran. At ED pt was given prednisone and epi. Pt discharged and rash was improving. Possible diagnosis at discharge was possible scombroid fish poisoning. Pt discharged and upon arrival to home, the rash reappeared in a different location on body however more severe. Pt was transported to hospital without treatment due to recency of medication administration. I have attached a photo of the urticaria. It almost looks like blotches of water paint. Any ideas on diagnosis and the rash? Not your typical rash. Any help would be appreciated.

Update 1

Thank you for your assistance.

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