???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????.Trichothiodystrophy, generally known as TTD, is usually a unusual inherited condition that has an effect on several aspects of your body. The hallmark of the issue is hair that is definitely sparse and easily damaged. [from MedlinePlus Genetics]?? ???? ???? ??? ?? ???