Please don't throw tomatoes at me coz this is foreign territory for me, but I have only heard of scab hair w/r/t people who just BC'd. Apparently after you BC relaxed hair, your hair feels kinda strange for a while and doesn't really behave like your real hair will. I guess you can refer to new growth as "scab hair" per the definition below but really when people talk of scab hair, I always imagine difficult hair that behaves oddly and feels hard and rough and sticks out...usually after relaxed hair has been cut off. Not soft, curly or wavy. Hair that is not exactly how the person's true texture will be. IIRC, some people will BC after transitioning and then still have to deal with a patch of hair that isn't uniform or behaving as they expected. I've never really dug deep to grasp this phenomenon coz my tiny heads can only process info that is useful to me, and since I'm not relaxed....
According to Motowngirl:
Another blog on scab hair:
http://naturallyyantan.blogspot.com/2009/06/scab-hair-or-soo-they-call-it.html
Oooh...ignore everything I just posted. I found an LHCF thread on scab hair so OP you might be right. I shall now tiptoe out of thread before I get hurt discussing stuff I know nuffin about. On second thoughts, I'ma jet outta here coz I see tomatoes headed my way
Thread on scab hair:
http://www.longhaircareforum.com/showthread.php?p=7645769#post7645769