Friday Pop Quiz #20 – 5/17

differential diagnosis

Answer: E. Solar urticaria

Solar urticaria produces erythematous, edematous papules/plaques, not erythematous, eczematous patches/plaques, in sun exposed areas. Photoallergic contact, airborne contact, chronic actinic dermatitis, and drug photosensitivity can all result in erythematous, eczematous patches in sun exposed areas. Subtle clues may help distinguish them such as involvement of the submental area in an airborne contact dermatitis.

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