Scalped chick medical care

What should I do? I knew sometimes polish got picked on but I wasn’t aware of the extent. They all grew up together and are maybe a month or so old, checked on every morning before work and as soon as I come home. When I left they were fine, so all of a sudden over 9 hours they picked on all 3 of my polish with no previous picking behaviors. This one is the worst- the rest I simply sprayed with something that said is for picking wounds. But what do I do here?