???? ???? ??? ??? ?? ??? ??? ???? ????,????,???? ?? ?? ??? ?? ?? ???? ??? ?? ? ?? ? ??? ??????. ?? ??? ????? ?????.Trichothiodystrophy, typically known as TTD, is usually a uncommon inherited ailment that impacts a lot of portions of the human body. The hallmark of this problem is hair which is sparse and simply damaged. [from MedlinePlus Genetics]