What is granuloma annulare?

Updated: Oct 29, 2018
  • Author: Ruby Ghadially, MBChB, FRCP(C)Derm; Chief Editor: William D James, MD  more...
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Answer

Granuloma annulare (GA) is a benign inflammatory dermatosis. T. Colcott Fox first described granuloma annulare in 1895; however, not until 1902 did Radcliffe-Crocker label it as granuloma annulare.

Granuloma annulare is relatively common disease that occurs in all age groups, but it is rare in infancy. [1, 2] Granuloma annulare is characterized clinically by dermal papules and annular plaques (see the image below). The precise cause is unknown. Histological examination reveals foci of degenerative collagen associated with palisaded granulomatous inflammation.

Granuloma annulare. By Mierlo at English Wikipedia Granuloma annulare. By Mierlo at English Wikipedia - Transferred from en.wikipedia to Commons by Stevenfruitsmaak using CommonsHelper., Public Domain, https://commons.wikimedia.org/w/index.php?curid=4560836.

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