There are some medications, foods, and cosmetics that contain ingredients which can cause ultra-sensitivity to light-either indoors or outdoors. You should remove all cosmetics before tanning. Always check with you physician to see if any of your new or existing medications contain photosynthesizing agents. Beyond Bronze also has a list of agents that you can read over to double check. Although any of these products may not cause you sensitivity, it is good to know whether or not sensitivity is possible.