4.3. Minimal Erythema Dose (MED) and Ultraviolet Light Exposure (UVR): The risks associated with this procedure are minimal, as only the testing sites will be exposed. The consequences of being exposed to UV light are short-term, and primarily involve mild redness at the exposure site followed by minor itching and dryness of the skin several days later. The degree of the sunburn is typically mild to moderate and the UV dose used is not enough to cause blistering of the skin.