What Causes Swelling In Forehead And From Eye Brow To Nose?

Hi, I have a slight, but noticeable swelling on my forehead, the swelling goes from the middle of my left eye brow, to the entire bridge of my nose. This swelling began a couple of days ago. I am also suffering from pressure/tension there, which extends to my nose and have suffered from a 'heavy head'. I dont know if its related, but I have also recently developed diahorrea.