Image of the Week: What is causing these ruptured blisters?

A 60-year-old woman presented with a history of intermittent episodes of tense, fluid-filled blisters covering her abdomen, back, and arms. Upon rupturing, moist erosions developed, resulting in postinflammatory hyperpigmentation as shown in the image above.

The Image of the Week for October 25 is brought to you in partnership with:

Figure 1 logo