Anniebee
Crowing
Welcome.
Can't move past photos. Were you told what breed your chicks are? If they came from a mixed pen it could just be her make up to be smaller. She could even be a naked neck if you are lucky. I can't zoom in on the photo on this device unfortunately.
If she's eating and behaving normally, doesn't have diarrhoea or any bad signs and you're providing all normal care needs. Heat, chick starter etc. I wouldn't stress. She will probably feather out shortly.
Far more knowledgable people than I might have better advice though.
Keep us updated.
I must go now and see who is trying to crow.
MyHaven ( this is my fourth go at posting --- things are not as they should be on this site here !!! )
If you go to the ORIGINAL photographs posted my mooandmcgee, click or double click on them - the larger photograph should show up. Then just use ( < back ) to return to the post ... but you probably know that already
First photo shows very plainly, the naked neck on the chicken. And I am sure you know one heckuva lot more than I do about various breeds, some of which would display this oddity, as you mentioned ....
Will comment further to mooandmcgee - in welcome and whatever I might be able to help with ( which unfortunately, wouldn't be much ).
Cheers.......