What is the procedure for a pre-sensitivity test to UV light?

A pre-sensitivity test to UV light is designed to assess how the skin reacts to UV exposure without subjecting the entire area to potential damage. The method described in the correct choice involves placing paper with cut holes on the skin, which acts as a barrier. This allows for controlled exposure and the ability to evaluate localized reactions.

After 24 hours, any changes in the skin under the holes can indicate how the skin is likely to react to UV light in broader applications, such as during treatments or sun exposure. This method provides a clear, safe, and effective way to gauge sensitivity, as it minimizes the risk of overexposure while still giving insight into individual skin responses.

In contrast, options that suggest direct exposure to UV light for set times are more likely to result in adverse skin reactions without giving a nuanced understanding of sensitivity. For instance, exposing the skin directly to UV light for five minutes could lead to burning or irritation without providing a comprehensive evaluation of sensitivity. Similarly, applying UV cream and observing the skin for a short duration, or using a UV lamp for a set time, may not give a full representation of how the skin tolerates UV exposure over time. These methods do not allow for the controlled assessment that the paper method provides.