Hypotri­chosis is a rare con­di­tion that is con­gen­i­tal; which means indi­vid­u­als suf­fer­ing from this con­di­tion were born with­out hair in the affected area, and will not have hair in the affected area unless opt­ing to undergo cor­rec­tional surgery. Hypotri­chosis is a con­di­tion that can be described as the scalp never hav­ing any hair growth. Alope­cia describes any con­di­tion where there was once hair growth, but as a symp­tom of the dis­ease the hair falls out. Hypotri­chosis is a syn­drome in which there was never exist­ing hair to begin with, the affected area remains bald through the life span of the indi­vid­ual affected by this dis­ease. It is a con­gen­i­tal dis­ease, due to genetic aber­ra­tions or defects of embry­onic development.

There are three types of Hypotrichosis

Tri­an­gu­lar alopecia

Tri­an­gu­lar alope­cia is usu­ally appar­ent from birth. A tri­an­gu­lar patch of skin and hair above the tem­ple is affected; this affected area does not grow hair. For­tu­nately this area can be sur­gi­cally removed or hair can be trans­planted to the area.

Con­gen­i­tal atrichia

Con­gen­i­tal atrichia is genetic and runs in fam­i­lies; it is also a gene defect that can spon­ta­neously develop in the embryo dur­ing preg­nancy. Peo­ple in some cases can be born with a full head of hair but, in early child­hood they lose all their hair and it never regrows

Apla­sia cutis congenital

Apla­sia cutis con­gen­i­tal is a devel­op­men­tal defect. The skin of the infant in the mother’s womb doesn’t totally develop. Babies are some­times born with a patch of skin that is like an open wound. How­ever if the defect is large it usu­ally requires and oper­a­tion. Dur­ing the oper­a­tion a Sur­geon will cut out the affected area and close up the skin.