If the incision has a lot of tension (is very tight), some surgeons will leave the sutures in longer. However, 12 days for suture removal may be a little long and runs the risk of leaving suture marks or railroad track scars. You should call your surgeon's office to have your concerns addressed.
Italian seasoning is a spice mixture popular in many parts of the world that attempts to capture some of the most common flavors of Italian cooking. It is typically sold as a dried herb mix. It can contain a wide range of ingredients, but rosemary, oregano, thyme, and marjoram are usually some of the most common.
But, I would recommend you not mix your spices into a homemade Italian seasoning mix, for a few reasons. First, some of the core mix are better dry, like Oregano -- Oregano needs to dry out to attain full flavor.