[Cutaneous manifestations in trisomy 21].

The possibility of cutaneous manifestations in Down's syndromes not a surprise because we known that this affection affects the three embryonic parts. This cutaneous disorder is described by many authors but it is variable and not specific. The authors had occasion to see four cases of alopecia areata in mongolian children. They do an analytic study of variable manifestations. They insist on frequency of hyperkeratotic lesions, alopecia areata, alterations of vasomotricity and elastic dystrophies. In the group of chromosomic aberrations, down's syndrome is alone where the cutaneous manifestations are studied because the patients have a good survival.