what i have alawys done is to apply
a small dab of vicks 44d on the pecked area .
it has alawys seemed to me that the ones doing the pecking
have a great dislike for vicks .
Zeke

Crowding, excessive heat and too much light can make pecking worse. Once a chick has a red spot anywhere, the other chicks are merciless. Try raising the heat lamp a bit at a time until the chicks seem uncomfortable and crowd under it. That will be TOO cool, so lower it just a bit until they spread out and go about their business. If you have a blue bulb, it may help.

If they are in a bright room, try covering the window with a sheet to lower the light levels. Turn off any unnecessary lights.

What are you feeding? Adding some hard-boiled egg yolk crumbled and some finely chopped dandelions, grass and clover to their diet should help. If nothing is growing yet, start some wheat or other grain in a container. It will sprout and give them lovely grass. These foods provide extra protein and nutrients and also act as a diversion. Once they start eating these things, they also need chick sized grit or coarse sand. Some people use budgie grit from the pet shop.

Put some branches in for them to explore and practice hopping up and down on. A cheap budgie toy like one of those mirrors with a bell should also help. They are going to peck at something and the challenge is to make sure it is not another chick.

I went through this with my first chicks and ended up with a dozen isolation wards while the injured healed up. It was horrible. Act quickly before it gets out of hand.