Pulmonary nodules typically form when a bacterial or viral infection irritates the lung tissue. This causes a small clump of ...

Etiology: The cause of granuloma annulare is unknown. Granuloma annulare can occur at any age, but is seen predominantly in children and young adults. It occurs more frequently in females than males.

By identifying a cause of the disease ... This held true when the researchers looked at lung granulomas from sarcoidosis. But ...