Test your diagnostic skills in our regular dermatology quiz. What is the cause of these itchy bullae, which have occurred over the summer?
A 9-year-old girl presents with her mother, who is worried about bullae that have developed on the child’s lower and upper limbs during the recent summer (Figure 1). The lesions occur after the girl’s tennis lessons, persist for two to three days and then subside, and are followed by crusting and healing with post-inflammatory hyperpigmentation. The lesions are intensely pruritic and have tended to become infected.
The girl moved to Australia from the UK a year ago. She is otherwise well.