The response to 8 minimal erythema doses of ultraviolet light filtered through a 280 mμ cut-off filter was determined in 21 subjects who had no evidence of a sunlight-induced eruption and had taken no photosensitizing drugs. Distinct follicular papules were produced in 5 of the 21 when a sufficient dose of ultraviolet light above 280 mμ was used.
This phenomenon should be recognized so that it will not be confused with true positive phototests.
SCHORR WF, MONASH S. Positive Papular Phototests in Normal Subjects. Arch Dermatol. 1963;87(5):560–562. doi:10.1001/archderm.1963.01590170018003
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