"Granuloma" means a small mass of tissue that forms because of inflammation (swelling). "Annulare" means shaped like a ring.
Granuloma annulare is a harmless skin reaction that causes small, firm, raised bumps on the skin. The bumps form a ring with normal or slightly sunken skin at the center of the ring.
Doctors don't know what causes granuloma annulare. It may be a reaction from your immune system Overview of the Immune System The immune system is your body's defense system. It helps protect you from illness and infection. The immune system's job is to attack things that don’t belong in your body, including: Germs... read more .