Rashes

Definition

Rashes are visible changes in the texture or color of the skin that often manifest as red, inflamed patches. They can be caused by infections, allergies, or other underlying health conditions.

5 Must Know Facts For Your Next Test

1. Rashes can be symptomatic of various microbial infections including bacterial, viral, and fungal etiologies.
2. Staphylococcus aureus and Streptococcus pyogenes are common bacterial pathogens causing skin rashes.
3. Viral infections such as measles and chickenpox present with characteristic rashes.
4. Fungal infections like ringworm cause rashes that are typically circular with a clearer center.
5. Proper diagnosis of a rash often requires considering patient history, symptoms, and sometimes laboratory tests.

Review Questions

• What are the common microbial causes of skin rashes?
• How do fungal rashes differ in appearance from bacterial or viral rashes?
• What factors should be considered when diagnosing the cause of a rash?

Related terms

Dermatitis: Inflammation of the skin resulting in redness, swelling, and itching.

Erythema: Reddening of the skin usually due to increased blood flow.

Papule: A small raised bump on the skin that is often part of a rash.