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May 1963

Positive Papular Phototests in Normal Subjects

Arch Dermatol. 1963;87(5):560-562. doi:10.1001/archderm.1963.01590170018003

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.