Hypotrichosis simplex of the scalp

Definition

A rare alopecia characterized by scalp-limited progressive hair loss. Most of the patients present with normal hair at birth, progressive hair loss starts during the first decade of life and leads to almost complete loss (sparse, fine and short hairs may remain in some patients) of scalp hair by the third decade. Body, axillary and facial hair (including eyebrows, eye lashes and beard) are not affected. Teeth and nails develop normally.