I found one of my 4 week old pullets, Russet, in this condition several minutes ago. She was not like this this morning, so this had to have happened within the last couple of hours. She is kept with 15 other 4 week old chicks in a 20X20 pen with a six foot ceiling. The pen does have chicken wire around the outside (it's chain link covered in chicken wire).
I cleaned it with water the best I could and put R-7 ( anti septic for animals) on it. She is by herself in the recovery cage and, other than angry at being taken away from her flock, does not appear to notice that shes been scalped.