Hi, I am relatively new to having chickens and need some help as one of them is unwell! She has been losing feathers for the past few weeks but apart from that she has been fine (eating drinking and laying well) but over the last week she has had scab appearing where the feathers were! I have checked her over and I cant see any type of bugs on her and the other 3 she lives with are fine! I have taken her out of the run and put her on her own today just incase but am not reallt sure what is wrong and what i should be doing so would appreciate some help! She is about 30 weeks old, not sure what type of bird she is!