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Female patient, 17 years old, white, complaining of thinning, brittle hair, and lack of hair growth (). Such changes are reported to be happening since childhood and patient says she has never had her hair cut, also denying factors of aggravation or improvement of the problem. She mentions having a diagnosis of Stargardt's disease (progressive macular dystrophy) and makes continuous use of oral contraceptives and eye drops of carboxymethylcellulose.\nThe patient is part of a family of seven children of the same parents, and one of her brothers, a 30-year-old male, has thinning, brittle hair, and lack of hair growth and also has been diagnosed with progressive macular dystrophy.\nLaboratory tests were performed, including blood count, thyroid function, ferritin, and VDRL, which were all within normal limits. Optical microscopy identified normal telogen hair and the pathology was consistent with congenital hypotrichosis ().