???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????.Trichothiodystrophy, normally referred to as TTD, is a exceptional inherited situation that has an effect on a lot of parts of your body. The hallmark of the problem is hair which is sparse and simply broken. [from MedlinePlus Genetics]?????? ???? ????? ?? ?? ??? ?? ?