???? ???? ??? ??? ?? ??? ??? ???? ????,????,???? ?? ?? ??? ?? ?? ???? ??? ?? ? ?? ? ??? ??????. ?? ??? ????? ?????.Trichothiodystrophy, commonly known as TTD, can be a rare inherited issue that impacts lots of elements of the human body. The hallmark of this affliction is hair which is sparse and simply damaged. [from MedlinePlus Genetics]?? ??? ??