Welcome to BYC. Can you post a picture of the head? This is common with Polish chickens to get their head feathers pecked out. Once it starts, it can become bald in a day or two. I always used BluKote Spray on my Polish’s head every other day when it first started, until feathers had completely grown back in a bout 6 weeks. You could also try pine tar which is more messy, but the chickens do not like the taste or to get that on the beaks. My Polish would have this happen about once or twice a year, and the important thing is to notice it happening, before it gets out of hand, so the comb does not become bloody.