Redness vs rash: What is the difference?

Is redness a rash?

Sometimes, but not always. Facial redness can come from flushing, sunburn or rosacea, as well as a rash such as contact dermatitis. A rash can include itching, swelling, bumps, dry patches, scaling, blisters or pain. Redness and rash overlap, so the terminology is not quite the tidy filing system it pretends to be.3 4

What you notice	What it tells you
Redness	A colour change, medically called erythema.
Redness with itching, swelling, bumps or scaling	Features that can occur with a rash.
Burning or stinging after contact with a substance	Possible contact dermatitis, a skin reaction to an irritant or allergen.
Red spots that do not become paler when pressed	Possible bleeding under the skin rather than ordinary redness.

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Can skincare cause redness and a rash?

Yes. Contact dermatitis develops when something touching the skin irritates it or triggers an allergic reaction. Soaps can irritate skin, while fragrances and preservatives can cause allergic reactions. Irritant contact dermatitis can start immediately or within 48 hours of exposure. Allergic reactions can also be immediate or delayed. A product you have used for years can still be responsible; a long acquaintance is not an ingredient safety certificate.3 4 5

What should you do next?

1Check for the urgent symptoms listed below before treating the area at home.
2Consider what touched the affected skin and when symptoms started. Include familiar products, not just new purchases.
3Stop exposing the skin to an identified irritant or allergen. Contact dermatitis tends to clear when the trigger is removed.
4Use mild, fragrance free cleansers and moisturizers, and avoid scratching. Scratching can break the skin and allow germs in.
5Get the cause assessed if the rash is severe, persists or comes with other symptoms. If facial redness lasts more than two weeks, make an appointment with a dermatologist.

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Treatment depends on the cause. Moisturizers, medicines that reduce inflammation and antihistamines that reduce itching are options for certain rashes, not interchangeable treatments for every red patch. Check medication directions: some medicines cause reactions in sunlight, and using hydrocortisone longer than directed can itself cause a skin reaction. Ask your prescriber about a suspected medication reaction rather than changing prescribed treatment yourself.1 2 3 4

How long should redness or a rash last?

There is no single recovery time. Some rashes develop immediately, while others form over several days. Many clear fairly quickly, but healing can take days or weeks. Conditions such as eczema and psoriasis can cause recurring rashes that need ongoing care. Rosacea can cause facial redness that lasts longer over time and needs treatment to lessen it.1 3 4 6

When does a rash need medical attention?

Seek emergency medical care immediately if you have trouble breathing or swallowing, or your eyes or lips swell.6

Get medical attention for a rash with any of these features:

It spreads rapidly or covers most of the body.
It is painful, blisters, or develops open sores or raw skin.
It involves the eyes, lips, mouth or genital skin.
It comes with fever or illness.
It has pus, yellow or golden crusts, warmth, swelling or an unpleasant smell.

Ordinary redness becomes paler when pressed, a response called blanching. Bleeding under the skin does not. Tiny red dots or larger flat patches that do not fade under pressure need assessment if unexplained; bleeding into the skin, apart from a common bruise, should always be checked by a healthcare professional.2

Where this answer comes from

1Rash | Dermatitis | Skin Rashmedlineplus.gov
2Bleeding into the skin: MedlinePlus Medical Encyclopediamedlineplus.gov
310 reasons your face is redaad.org
4Skin Rash: Types, Symptoms, Causes, Diagnosis & Treatmentsmy.clevelandclinic.org
5Contact dermatitis - Symptomsnhs.uk
6Rash 101 in adults: When to seek medical treatmentaad.org