Hypomelanosis of Ito
    
        
        
            
        
        Hypomelanosis of Ito (HI) syndrome is one of several ectodermal dysplasias, a group of syndromes deriving from abnormalities of the ectodermal structures, which include the hair, teeth, nails, sweat glands, cranial-facial structure, and hands. HI is... 
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