Just spray the Blu-Kote on the affected area. I've used it several times. It not only covers up the red area,(to draw less attention), it is an antiseptic.
I just used it on a 3week old that had been pecked down to the bone on top of her skull. She was in so much pain that she didnt seem to notice and done well since. I did have to re-apply a week later when the blue dye wore off and she still had a big scab on the top of her head, once again, she didnt seem to notice.
Mine has it at the opposite end though. And the blu-kote isn't working. I put her in with the others and they pecked at her again, so I had to remove her again. I can't deal with this. It's pathetic. I listed her in the buy/sell/trade forum to see if someone in my area might be interested in her.
You really need to separate any wounded chick from the others. They will peck the wound to death.
Blu-kote is a good idea. It may be stinging her a bit. If the wound is very wide, you may need red-kote instead. Blu-kote dries a wound, red-kote keeps it moist to prevent cracking of large scabs.
I had a silky that the others pecked her tail feathers - just coming in and brought blood - I took a q-tip and sprayed it with the blue kote and then used it to rub on it's bum and covered it good - then I took some medicated bag balm and put over the blue kote - put it on thick - and popped it back in with the others - they tasted it and that was it - no more picking. The reason I use the Q-tip is if I spray it while holding the chick, I always have a blue/purple finger/hand, etc.
I only had a few chicks together, if you have more, it's best to keep them separate until it get's better. You always need a brooder or hospital area ready when you have chickens.
O.K. now my next question. How long before the tail feathers will grow back? and can I put Neosporin on the bare tail with the blu-kote now that I find out that it dries the area?