Spot Dx — What’s behind this eight-year-old rash?

A 68-year-old Caucasian woman presents with an eight-year history of an erythematous, pruritic and scaly rash over her central chest, upper back and forearms.

Test your clinical know-how by taking the quiz below. If you select the wrong answer, have another go — you can try as many times as you like!

A 68-year-old Caucasian woman presents with an eight-year history of an erythematous, pruritic and scaly rash over her central chest, upper back and forearms.

This is on a background of breast cancer, which was managed with lumpectomy and radiotherapy, resulting in significant post-radiation dermatitis on her right breast.