Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
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
Rashes can be symptomatic of various microbial infections including bacterial, viral, and fungal etiologies.
Staphylococcus aureus and Streptococcus pyogenes are common bacterial pathogens causing skin rashes.
Viral infections such as measles and chickenpox present with characteristic rashes.
Fungal infections like ringworm cause rashes that are typically circular with a clearer center.
Proper diagnosis of a rash often requires considering patient history, symptoms, and sometimes laboratory tests.
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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.