Skin Rash: What It May Mean & When to Get Help
A rash is a visible change in the skin, not one single diagnosis. Learn what to notice, safe first steps, and the warning signs that need urgent medical care.
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Quick Reference Facts
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In simple words
A skin rash is a new change in the colour, texture or feeling of the skin. It may be itchy, sore, raised, scaly, dry, blistered, or made up of spots or patches. The same rash can look different on different skin tones, so changes in warmth, swelling, texture, pain or itch can be as useful to notice as colour.
A rash is a symptom, not one single diagnosis. It can be caused by irritation, allergy, eczema, hives, infection, a medicine reaction or another condition. Where it began, how quickly it spread, whether there is pain, itch, fever or swelling, and any new product, medicine or illness all help a clinician decide what is likely.
Common Causes
- Contact with an irritant or allergen, such as a new skin product, detergent, fabric, metal, plant, adhesive or medicine
- Eczema, psoriasis, hives, heat rash, or another inflammatory skin condition
- A viral, fungal or bacterial infection, or an insect bite or sting
- A medicine reaction or another illness affecting the body
Clinical Red Flags
Seek urgent medical attention at an emergency department or primary care clinic if you present with any of the following symptoms:
- Call emergency services or go to the nearest emergency department for trouble breathing or swallowing, wheeze, faintness, or swelling of the lips, tongue, throat, eyes or face.
- Seek emergency care for a rapidly spreading, widespread, painful, blistering or peeling rash, especially after a new medicine or with fever or feeling very unwell.
- Seek urgent medical advice for a purple or non-fading rash with fever or severe illness, a rash involving the eyes, mouth or genital skin, or signs of infection such as pus, warmth, severe pain, red streaks or rapidly increasing swelling.
- Arrange a clinical review if a new rash is not improving, keeps returning, is spreading, or began after a medicine change. Do not stop a prescribed medicine without advice unless emergency care tells you to do so.
Lifestyle & Diet Support
Avoid scratching, hot showers and harsh or fragranced products. Use a gentle cleanser and bland moisturiser if the skin is dry, and stop a clearly irritating new product if it is safe to do so. Keep a brief note of when the rash began, where it spread, recent medicines, illnesses, products and exposures. Take clear photos to show a clinician if it persists or changes. Avoid trying several new creams at once, as this can irritate the skin or make the cause harder to identify.
Frequently Asked Questions
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Differential Diagnosis Matrix
A clinician may consider contact dermatitis, eczema, hives, psoriasis, fungal infection, scabies, a viral rash or a medicine reaction. Clear photographs taken in natural light and a short timeline of where it started, how it changed, new exposures, medicines and other symptoms can make an assessment more useful.
Reference Citations & Evidence Sources
Clinical Reviews & Textbooks
- CIT-0147Clinical Review pending verification
- CIT-0148Clinical Review pending verification
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