A 17-year-old black woman presented with a rash of eight months’ duration on her back and chest. The eruption, which had begun as just a few bumps, seemed to be spreading. She reported no itching or pain. Examination of her upper back revealed many hyperpigmented papules that had coalesced to become larger verrucous plaques and form a reticular network. No dermal induration or erythema was apparent. A previous diagnosis of eczema had resulted in unsuccessful treatment with topical steroids.

What is the diagnosis?

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