I am wondering if the under eye swelling and sinus pressure are related and indeed if it could be something other than infection and if I CT scan will be of help to solving the issue of either or both. It sounds like your symptoms have been quite bothersome for some time and you should discuss them with your physician.
Cordovan is an equine leather made from the fibrous flat muscle (or shell) beneath the hide on the rump of the horse. The leather derives its name from the city of Cordoba, Spain, where it was originally prepared by the Moors.
Chromexcel is specific to Horween. It is calf leather, but it is chrome tanned first then vegetable retanned (like cordovan). It creates a very durable, beautiful pull-up leather due to the vegetable retanning. Vegetable tanning also is more resistant to bacteria, and fungus and creates a more durable process, whereas chrome tanning creates a much more flexible, and stretchy kind of leather. Chromexcel you get the best of both worlds.