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Skin rash: causes, warning signs & what to do

Rashes are extremely common and usually harmless — from allergy or eczema to viral infections. A few patterns signal an emergency.

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Common causes of skin rash

When to see a doctor urgently

Frequently asked questions

What is the "glass test" for a rash?

Press a clear glass firmly over the rash. If the spots do NOT fade under pressure and there is fever, it can indicate meningitis or sepsis — seek emergency care immediately.

Can MedDroid look at a photo of my rash?

Yes — attach a clear photo and MedDroid will describe what it appears to show and common possibilities. It cannot diagnose; anything spreading, blistering or with fever needs a doctor.

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MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.