Delayed prolonged vascular leakage can result from:
Burns
X-Rays
Exposure to the sun
All of the above
In some forms of mild injury (e.g., after burns, irradiation or ultraviolet radiation, and exposure to ceain bacterial toxins), vascular leakage begins after a delay of 2 to 12 hours and lasts for several hours or even days. Delayed prolonged leakage may be caused by contraction of endothelial cells or mild endothelial damage. Sunburn is a classic example of damage that results in late-appearing vascular leakage.
Basic Concepts and Vascular changes of Acute Inflammation