A 5-year-old girl has sparse, dry, and brittle hair but is otherwise healthy.  
     
           June 2021   in “International journal of research in dermatology”    A boy and his father with hereditary hypotrichosis simplex were treated for hair loss, but the treatment result is unknown.  
     
           4 citations
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  January 2018   in “International Journal of Trichology”    A rare genetic disease causes sparse hair and early blindness due to a gene mutation.  
               13 citations
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  August 2005   in “Journal of Investigative Dermatology Symposium Proceedings”    Mutations in the DSG4 gene cause fragile, sparse hair in humans, mice, and rats.  
     
           October 2021   in “Dermatology practical & conceptual”    A Saudi girl was diagnosed with Loose Anagen Hair Syndrome, a rare condition causing easy hair loss without scarring.