Hair, hair, everywhere: Scab hair
I have never experianced scab hair but you asked and this is the best answer I could find.
Scab hair – Hair that is directly underneath the scalp that has been affected by the hash chemicals(i.e. relaxers, texturizers). Even though the hair is new growth it isn’t “trained” to behave in it’s natural state. The hair can be straight-wiry, very dry, hard, and brittle. It usually takes somewhere around 6 months to a year to completely grow it out. – Derived from Motowngirl.com