Solar Urticaria- Rare photodermatosis causing urticaria minutes after sun exposure; little tendency toward resolution
- Presents with burning and erythema followed by urticaria immediately after sun exposure; severe attacks may be associated with anaphylactic-type response with lightheadedness, nausea, syncope and bronchospasm
- Histology: mild dermal edema with perivascular neutrophilic and eosinophilic infiltrate
- Treatment: photoprotection, non-sedating histamine and sometimes topical corticosteroids, graduated UV exposure
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