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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.
Common causes of skin rash
- Allergic reaction or contact dermatitis
- Eczema or psoriasis
- Hives (urticaria)
- Viral infections (e.g. chickenpox, measles)
- Fungal or bacterial skin infection
- Heat rash; drug reactions
When to see a doctor urgently
- A rash that does not fade when pressed, with fever — call your local emergency number now (meningitis/sepsis)
- Rash with lip/face swelling or difficulty breathing (anaphylaxis)
- Widespread blistering or peeling skin
- A rapidly spreading, hot, painful red area with fever
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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Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. 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.