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​Symptoms and Signs – Differential Diagnosis of Polymorphous Light Eruption
• Lymphocytic infiltration (on histologic examination, marked papillary edema favors polymorphic light eruption)
• Reticular erythematous mucinosis (clinically, polymorphous light eruption resolves once exposure to sunlight has ceased, in contrast to the persistent lesions of reticular erythematous mucinosis)
• SLE (most cases of polymorphic light eruption are negative with immunofluorescence testing)
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