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JAMA Dermatology Clinicopathological Challenge
April 28, 2021

Skin-Colored Papules on the Right Lower Back of an Elderly Man

Author Affiliations
  • 1Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
JAMA Dermatol. Published online April 28, 2021. doi:10.1001/jamadermatol.2021.0444

A man in his 60s presented to our dermatology outpatient department with a 5-year history of pruritic papules on the right side of his lower back. He was otherwise healthy, with no family history of a similar condition. Physical examination results showed multiple dome-shaped, skin-colored, firm papules on his right lower back, arranged in a blaschkoid distribution (Figure 1A). The lesions varied in size, with some coalescing into irregular-shaped, larger papules. Telangiectasis could be seen on some of the lesions. A skin biopsy was performed on his back and submitted for further histopathologic analysis (Figure 1B and C).

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