What is the nature of the subcutaneous nodules formed during rheumatic fever?

Subcutaneous nodules formed during rheumatic fever are typically described as painless and firm. These nodules, known as Aschoff bodies, are a result of inflammatory processes associated with the condition. They are located in the subcutaneous tissue and often appear around the joints, commonly the elbows, knees, and other areas. Their firm consistency is due to the infiltration of immune cells and the resulting fibrosis in the affected tissues.

The absence of pain distinguishes them from other types of nodules, which may be associated with infections or other inflammatory conditions that cause tenderness. Understanding their characteristics, such as being painless and firm, helps in differentiating rheumatic fever manifestations from other conditions affecting the skin and soft tissues.