The quality of post-operative care can also vary dramatically, depending on the hospital and country, and may be different from US or European standards. Also, traveling long distances soon after surgery can increase the risk of complications. Long flights and decreased mobility associated with window seats can predispose one towards developing deep vein thrombosis and potentially a pulmonary embolism. Other vacation activities can be problematic as well — for example, scars may become darker and more noticeable if they are sunburned while healing.