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JAMA Dermatology Clinicopathological Challenge
August 19, 2020

Concentric Annular Truncal Eruption

Author Affiliations
  • 1Department of Dermatology, Mayo Clinic, Rochester, Minnesota
  • 2Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
JAMA Dermatol. 2020;156(10):1129-1130. doi:10.1001/jamadermatol.2020.2779

A man in his 60s presented to the dermatology clinic with a widespread, intermittently pruritic eruption. Examination showed coalescing annular, arcuate, and serpiginous red scaling plaques in a concentric pattern diffusely involving the chest, back, and abdomen with extension to proximal extremities (Figure, A and B). Punch biopsies from the chest (Figure, C and D) and back were obtained for histopathology and tissue culture. Treatment with topical corticosteroids under wet dressings was associated with partial improvement in the eruption and pruritus.

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