A 32-year-old woman visited her doctor concerned about a rash that developed on her neck and chest 3 months prior. The patient was distressed by its appearance, and experienced mild pruritus, but appeared well and had no systemic symptoms. The patient had a medical history of alopecia areata and Hashimoto thyroiditis.
On examination, numerous follicularly-based, whitish, smooth papules, some confluent, were seen on the upper chest and neck. Histopathologic examination showed epidermal atrophy, vacuolar degeneration at the dermal-epidermal junction, and homogenous hyalinization of the papillary dermis. The patient had no history of dermatological disease or allergies.
What’s the diagnosis?
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