Rubbery plaques on the shoulders, upper back, and chest

Case #1

A 24-year-old woman presents for treatment of "severe acne" that is unresponsive to all topical treatments, including topical benzoyl peroxide, tretinoin, clindamycin, and dapsone. She notes involvement mostly on her shoulders and back, with a few lesions on her chest. She reports that the lesions are often itchy and hypersensitive to touch. She denies any prior trauma to the ...