Epidermolysis bullosa is a physical condition in which the outer layer of skin is paper-thin and extremely fragile, meaning that the slightest external force results in the skin flaying off.
Example
たなかさんの おむつこうかんを しているとき、おしりに ひょうひはくりを はっけんしました。
When we were changing Mr. Tanaka's incontinence underwear we discovered a case of epidermolysis bullosa on his backside.