The American Society of Dermatopathology

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Interactive Case Study - August 2022

71-year-old female with linear, pruritic, hyperpigmented papules on her arm

Itohan Omorodion, BS, MPH ; ​Rodrigo Valdes-Rodriguez, MD

Question 1:

A 71-year-old female presented with pruritic, hyperpigmented, dark brown-black papules that were arranged in a linear distribution along her right forearm. She first noticed these lesions six months ago. No nail abnormalities were observed. She did not have any underlying medical or dermatological conditions. 

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Clinical Image

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Which of the following is the best diagnosis?