Which group of individuals may experience heightened sensitivity during tanning?

Individuals on photosensitizing medications may experience heightened sensitivity during tanning due to the way these medications interact with UV light. Photosensitizing medications can amplify the skin's reaction to sunlight and artificial tanning sources, leading to an increased risk of sunburn and other adverse skin reactions. This heightened sensitivity occurs because these medications can cause the skin to become more reactive to UV rays, increasing the likelihood of developing rashes or burns when exposed to tanning equipment or sunlight.

In contrast, the other groups mentioned may not experience the same level of sensitivity. Individuals with dry skin might face issues related to skin hydration but do not inherently have an increased sensitivity to tanning due to their skin type. Similarly, those with oily skin or normal skin do not have a direct correlation to heightened sensitivity from tanning compared to those taking photosensitizing medications. This is why individuals on such medications stand out as a unique group that requires special attention when it comes to tanning practices.