Sorry to hear about your drake.
Before I suggest anything, I'd really like you to get a few more, up-close, clear pictures of the sore? It's kind of hard to make out what's really going on.
And, may I suggest you use something else to deal with the wound? Hydrogen Peroxide generally isn't used with birds due to its destructive behavior towards wounds, which can ultimately affect proper healing. Saline (homemade if you want), diluted down betadine, or chlorhexidine would all be better choices for flushing/cleaning wounds.