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6. Causes of Granuloma Annulare

Most cases of granuloma annulare are idiopathic, which means there is no known cause. Possible triggers include minor skin injuries, medications, animal or insect bites, sun exposure, vaccinations, and tuberculin skin tests. GA triggered by vaccines or skin tests fades away within a few days or weeks. The condition is also a possible complication of pseudorheumatoid nodules or shingles from the herpes zoster virus and other viral infections, especially hepatitis.

sunburn, causes, skin tests, idiopathic IvanJekic / Getty Images

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