Nodules

Definition

Nodules are small, raised areas or lumps that can form on the skin due to infections, inflammation, or other causes. In microbiology, they are often associated with certain bacterial and fungal infections.

5 Must Know Facts For Your Next Test

1. Nodules can be a symptom of bacterial infections such as Mycobacterium leprae which causes leprosy.
2. Fungal infections like Sporotrichosis may also present as nodules on the skin.
3. They are typically firm to touch and can be painful or painless depending on the underlying cause.
4. Diagnosis of nodules may involve microbial cultures, biopsy, or imaging studies to determine the causative agent.
5. Treatment varies widely depending on whether the nodules are caused by bacteria, fungi, or other factors.

Review Questions

• What bacterial infection is commonly associated with the formation of nodules?
• How do fungal infections like Sporotrichosis manifest on the skin?
• What diagnostic techniques are used to identify the cause of nodules?

Related terms

Papule: A small raised bump on the skin that is less than one centimeter in diameter.

Abscess: A collection of pus that has built up within tissue due to an infection.

Biopsy: A medical procedure involving the extraction of sample cells or tissues for examination.