A woman aged 69 years was referred to dermatology outpatients with a 12-month history of periodic episodes of blisters affecting the extensor surfaces of her hands, feet and elbows. Blisters were described as painless, non-pruritic, usually containing blood and lasting approximately four days before crusting and healing. She was otherwise well with no systemic symptoms. She took no regular medications and was a non-smoker. On examination, there were resolving vesicles and bullae on the extensor aspect of the elbows, right index finger and the dorsum of the left foot (sites of friction). Milia were present at the sites of healed lesions (Figures 1, 2). No further lesions were noted on complete examination of the skin and mucosal surfaces.