SECTION EDITOR: MARY S. STONE, MD; ASSISTANT SECTION EDITORS: SOON BAHRAMI, MD; CARRIE ANN R. CUSACK, MD; SENAIT W. DYSON, MD; MOLLY A. HINSHAW, MD; ARNI K. KRISTJANSSON, MD
A 28-year-old African American man presented with a history of asymptomatic scaly areas on his back. He stated that the lesions started in his axilla and slowly expanded toward his back over the past 6 months. His medical history was remarkable only for urticaria controlled with daily use of cetirizine hydrochloride. Physical examination revealed perifollicular hyperkeratotic papules coalescing into well-demarcated plaques with fine scale and a slightly raised erythematous border in a blaschkoid distribution from his right axilla to his upper back (Figure 1). A biopsy specimen was obtained from his right posterior shoulder (Figure 2 and Figure 3).
Stewart L, Nuara A, Anand D, Kia K, Cockerell CJ. Perifollicular Papules and Hyperkeratotic Plaques on the Back in a Blaschkoid Distribution —Quiz Case. Arch Dermatol. 2011;147(7):857-862. doi:10.1001/archdermatol.2011.165-a