Seek urgent medical advice (urgent GP appointment / NHS 111) if eczema is blistered, crusty, leaking fluid, has pus-filled spots, is painful, swollen, or warm, suddenly worsens or spreads, or you have a high temperature / feel generally unwell. These can be signs of infected eczema or a more serious condition such as eczema herpeticum.

For treatment routes and prescription options (when appropriate), see:
✅ Eczema & Dermatitis Treatments

This page is a safety guide, not a diagnosis. If you’re worried, it’s always reasonable to seek clinician advice.

Table of Contents

Why red flags matter (what can go wrong)

Most eczema and dermatitis flares are uncomfortable but manageable with the right routine and plan. Red flags matter because eczema-prone skin can be more vulnerable to skin infections, and certain infections can worsen quickly without the right treatment.

There are two “big” complication categories to recognise fast:

Bacterial infection (often looks oozy/crusty/pustular; may need antibiotics).
Eczema herpeticum (a herpes virus infection on eczema skin; considered urgent and can spread rapidly).

Red flags that suggest infected eczema (bacterial infection)

If your eczema changes from “dry and itchy” to sore, oozy, and crusty, it may be infected and you should seek medical advice because additional treatment may be needed.

Signs to take seriously (same-day or urgent advice)

Weeping/leaking fluid from patches
Yellow/golden crusting or new “sticky” crusted areas
Spots filled with pus (pustules)
Eczema becomes painful (not just itchy)
Skin looks swollen or feels warm/hot
You feel unwell or develop a fever

Why these signs matter

Bacterial infection can present as impetigo-like crusting (classically honey-coloured crusts) and can sometimes progress into deeper infection (e.g., cellulitis), especially if the skin barrier is broken.

Red flags for eczema herpeticum (same-day urgent review)

Eczema herpeticum is considered an emergency because it can spread quickly and needs prompt treatment.

What it can look like

You should seek urgent care the same day if you have eczema and develop:

Clusters of blisters (often painful) or rapidly worsening “punched-out” looking sores
Eczema that becomes rapidly more painful and worsens quickly
Systemic symptoms like fever or feeling very unwell
Any concern about eye involvement (eczema herpeticum can affect the eyes)

If you think this might be the case, don’t wait for it to “settle” get urgent medical advice.

Eye/face red flags (don’t ignore these)

Because eyelid and eye-area skin is sensitive, and because some complications can affect the eyes, seek prompt advice if you notice:

Significant eyelid swelling
Eye pain, light sensitivity, or any vision changes
Rapidly worsening rash around the eye with blisters or severe pain

Severe flare / rapid deterioration red flags

Even without obvious infection, you should seek help urgently if:

Eczema suddenly gets worse or quickly spreads
It becomes unusually painful
You develop a high temperature or feel generally unwell

Also seek medical advice if:

Symptoms are so uncomfortable that they are affecting sleep and daily activities, or
Symptoms persist despite trying appropriate self-care steps.

(Your A5 page on mild vs moderate vs severe eczema is the best internal companion for this.)

What to do right now (step-by-step)

If you notice red flags, this is a sensible, practical sequence:

Assess for infection signs
- Ooze/crust/pus, pain, heat, swelling, fever/unwell → seek urgent advice.
Don’t delay if blisters + rapid worsening
- Especially if painful, clustered blisters or systemic symptoms → same-day urgent review.
Avoid aggravators
- Stop new skincare products and fragranced products during the flare (they can confuse the picture).
Reduce scratching
- Scratching spreads irritation and breaks skin further. Keep nails short and use cool compresses for itch while you seek advice.
Document changes
- A quick photo timeline can help clinicians see progression (especially if it’s changing day-to-day).

Next steps (treatments + product routes)

For your structured treatment options and prescription products, use the category hub:
✅ Eczema & Dermatitis Treatments

If your flare is not infected and you’re following an appropriate plan, mild topical options in your category include: