Sunscreens are in widespread use as a form of skin protection against solar ultraviolet radiation. Previous studies provide some data to show that the amount of sunscreen applied is less than manufacturers' recommendations, although studies have often used indirect measurement techniques. This study comprised 50 volunteers who applied a standard aqueous cream as a hypoallergenic analogue for sunscreen to one of their forearms. Two novel methods of directly measuring forearm area were used, based on a mathematical model and the use of a helically wrapped cloth belt.
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