Which physical findings are characteristic of a truncal pattern in seborrheic dermatitis?

Updated: Nov 13, 2020
  • Author: Marc Zachary Handler, MD; Chief Editor: William D James, MD  more...
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Answer

Two distinct truncal patterns of seborrheic dermatitis can occasionally occur. An annular or geographic petaloid scaling is the most common. A rare pityriasiform variety can be seen on the trunk and the neck, with peripheral scaling around ovoid patches, mimicking pityriasis rosea. Note the image below.

African Americans and persons from other darker-sk African Americans and persons from other darker-skinned races are susceptible to annular seborrheic dermatitis, also called petaloid seborrheic dermatitis or seborrhea petaloides. Sarcoidosis, secondary syphilis, and even discoid lupus may be in the differential in such cases. Courtesy of Jeffrey J. Meffert, MD.

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