Burning and tanning histories were studied in 790 white students 18 to 30 years of age by means of a self-administered questionnaire. Only 325 cases (41.1%) were classifiable according to the Fitzpatrick scheme (skin types I to IV). Skin type I (always burn, never tan) was recorded only twice (0.3%). The minimal erythemal dose was measured in a subgroup of 197 students; these results showed no significant correlation with the self-reported burning tendency. In 508 students the burning-tanning histories were compared with eye and hair color, freckling tendency, and number of moles. The tanning ability showed a better correlation with skin complexion characteristics than the burning tendency. It is concluded that self-reported burning-tanning histories form an unreliable means of skin typing.

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Background: Induction of delayed-type hypersensitivity has recently been introduced for resistant viral warts. The method is not painful and less destructive than most other modalities. Objective: We assessed the efficacy of topical diphencyprone (diphenylcyclopropenone) treatment for recalcitrant warts. Methods: From September 1988 to June 1995, 134 patients with periungual and/or palmoplantar warts were entered into the study. Eight weekly applications were delivered. Results: The scheduled treatment course and follow-up were completed by Ill patients. There were 49 complete and 18 partial remissions. The rate of positive responders (60%) compares with the results published by other authors. Conclusion: Diphencyprone is an effective treatment for resistant warts, especially in palmoplantar and periungual locations.

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