???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????.Trichothiodystrophy, usually called TTD, is usually a exceptional inherited issue that affects lots of portions of your body. The hallmark of the problem is hair that may be sparse and easily damaged. [from MedlinePlus Genetics]?? ???? ???? ??? ?? ???? ?? ???? ? ????