I had to take a shower and figured I would take my cockatiel with me. I showered first and he took a light misting after me. Once we were done he was preening and I noticed something under his wing. I wrapped him in a dry towel and lifted his wing and saw what looked like a wound... No feathers were on the wound, just around it. I have had cockatiels ever since my childhood and never saw a cockatiel with this kind of wound. I unfortunately can't get him into a vet until Saturday and I am really worried... I am linking a picture below. It's not the best quality but does anyone what it is and what I can do for him? I really don't want to put anything on the wound in case it might be toxic to him... Please let me know!!!!!