In short
A rash is an area of irritated or swollen skin.
Worth knowing4
Many rashes are itchy, red, painful, and irritated.
MedlinePlusRashes are a symptom of many different medical problems.
MedlinePlusSome rashes develop right away.
MedlinePlusRashes can have many different causes, so it matters to work out what kind it is before treating it.
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What helps1
Treatments may include moisturizers, lotions, baths, cortisone creams that relieve swelling, and antihistamines, which relieve itching.
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See a provider if1
See a health care provider if a rash is bad, does not go away, or comes with other symptoms.
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Sources
These pages describe what the sources say. They cannot say what is going on with your skin.
See what is going on with your skin.
A one-minute scan on your iPhone, a plain answer mapped to your face, and what helps, with its source. Free to start.