Photosensitivity is an increased sensitivity or abnormal response of the skin to sunlight or artificial light. In particular, both UVA radiation (longer wavelengths) and UVB radiation (shorter wavelengths) have been observed to trigger unusual reactions of the skin in people with certain disorders or those who are taking particular medications.
The most common manifestation of an increased photosensitivity is the appearance of lesions of various shapes and sizes on areas of the skin that have been exposed to sunlight. The time required for such a response to occur can be anywhere from under 30 minutes of exposure to sunlight to hours spent in it.
Skin Cancer Foundation Photosensitivity Report
By Deborah S. Sarnoff, MD, Ritu Saini, MD, and Andrew Handel
- Photosensitivity Basics
- Phototoxic Reactions vs. Photoallergic Reactions