Derm Dx: A girl with cardboard-like skin

A 5-year-old girl presents to the pediatric dermatologist for a routine follow-up evaluation. Shortly after birth the patient had developed blisters over her body. Later she developed thickened and ridged scaly skin that resembled corrugated cardboard, predominantly over the flexures and extensors.

The patient is otherwise healthy. Her father and the paternal grandmother also had similar skin conditions. ...