???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????.Trichothiodystrophy, generally known as TTD, can be a rare inherited affliction that has an effect on a lot of elements of the body. The hallmark of this ailment is hair which is sparse and easily broken. [from MedlinePlus Genetics]?? ??? ????? ??? ??? ???? ???? ??? ?