It looks like blocked nostrils. There could be a combination of feed, secretions, and dirt there. Some might call this nasal canker, but many times it is just a blockage that needs to be cleaned out. Try moistening the face with a few drops of hydrogen peroxide which will foam up a bit on the secretions. You then could use saline or water and take a wooden toothpick and try to gently get a little of the crud out. Be careful not to damage the nostrils, which can hadly be seen now. Repeat this prepocure tommorow and the next day. It is pretty hard to get it all out. It will look a bit like yellow pus or a bumblefoot kernel. Here is a link about this:
https://www.browneggblueegg.com/Article/PluggedNare/PluggedNare.html
