I have a dry patch of what appears to be skin in the inside of my nostril, on the cartilage side. It it somehow itchy, a little painful when I move my nose and sometimes it seems to outfrow so I get to take small parts of it away. I live with 2cats, my appartment is dry, and I just finished a cold it started during my cold/sinusitis. I've put polysporin on it but it didnt seem to change anything. What is it ?