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Updated: Aug 9, 2026
Minimal Erythema Dose (MED) Testing
Published on: May 28, 2013
Skin protection for photosensitized patients
V A Schwarz1, S D Klein, R Hornung
1Research Division of Gynecology, Department of Obstetrics and Gynecology, University Hospital, 8091 Zurich, Switzerland. Viola.Schwarz@fhk.usz.ch
Background And Objective:
The goal of this study was to evaluate various creams for their capability to protect photosensitized skin from visible light.
Study Design/Materials And Methods:
Two cover creams and creams containing various combinations of Vaseline with TiO(2), ZnO, and Fe(2)O(3) were used to measure the reduced light transmission and the light absorption spectrum. In vitro and in vivo tests were performed to assess the protection from light by above mentioned compounds.
Results:
The cover creams and the 50% TiO(2) cream showed similar efficacy in reducing light transmission, while the sunscreen was less efficient by a factor of 5. Cell protection by 25% TiO(2)+25% ZnO, TiO(2), or the cover creams was more efficient than protection by the sunscreen or other compounds. In vivo, the dark cover cream protected the skin by a factor of 3.4 better than the sunscreen.
Conclusion:
The dark cover cream has acceptable properties to protect photosensitized skin.
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