Pachyonychia congenita
    
        
        
            
        
        Pachyonychia congenita (PC) is one of the 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. Ectodermal dysplasias... 
read more