Pachyonychia congenita.
D002648:Child; D005260:Female; D006801:Humans; D007642:Keratosis / Q000473:pathology; D009260:Nail Diseases / Q000235:genetics* / Q000473:pathology; D009264:Nails, Malformed; D012871:Skin Diseases / Q000235:genetics* / Q000473:pathology