His beard is black because he is aggitated (and rightfully so) If the bleeding is coming from the outside of his mouth, you can apply some triple antibiotic ointment on it (NOT TOO MUCH). It is possible that he bit his tounge and that is where the blood is coming from. Please keep a close eye on it as it may prohibit him from eating comfortably. (If this is the case, offer him some meals of jarred first stage baby food) If you have not already done so, return him to his enclosure.
If your son stepped on his mid-section (hence internal bleeding) you need to seek veterinary care immediately.
I hope this helps and your beardie feels better. If you have any more questions (especially if you know where the bleeding is coming from) please feel free to ask :)
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