MedDroidEczema vs Psoriasis
Eczema vs psoriasis: differences in symptoms, tests and treatment
Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed
Medically reviewedEczema is very itchy, dry, inflamed skin that often affects skin creases such as the inner elbows and backs of the knees, and commonly starts in childhood. Psoriasis causes well-defined, thick red patches with silvery scales, typically on the outer elbows, knees, scalp and lower back, and can affect the nails and joints. Neither is contagious, and a doctor can usually tell them apart by looking at the skin.
Side-by-side comparison
| Feature | Eczema | Psoriasis |
|---|---|---|
| Cause | Weak skin barrier plus immune over-reaction; linked to allergies, asthma, family history; triggered by soaps, heat, sweat, dust | Immune-driven fast skin-cell turnover; runs in families; triggered by stress, infections, injury, some medicines, smoking, alcohol |
| Typical symptoms | Intense itch, dry, red or dark patches, oozing or crusting in flares, thickened skin from scratching; inner elbows, behind knees, neck, face | Raised, well-defined red or dark plaques with silvery-white scales; outer elbows, knees, scalp, lower back; nail pitting; itch is often milder |
| Onset & timing | Often begins in infancy or childhood; can start at any age | Usually starts between 15 and 35, but can appear at any age |
| Key tests | Usually diagnosed by examination; patch testing if contact allergy is suspected | Usually diagnosed by examination; skin biopsy occasionally; joint check if joints hurt |
| Treatment approach | Daily moisturisers, gentle soap substitutes, avoiding triggers, prescribed anti-inflammatory creams for flares | Moisturisers, prescribed creams, phototherapy, tablets or injectable treatments for more severe disease |
| Danger signs | Weeping, crusting or painful blisters with fever (infection) | Red skin over most of the body, pustules with fever, or swollen painful joints |
General patterns only. Symptoms overlap and vary from person to person. On a phone, scroll the table sideways to see both columns.
How doctors tell them apart
- Where the rash is: inner creases suggest eczema; outer elbows, knees and scalp suggest psoriasis.
- How it looks: sharp-edged thick scaly plaques suggest psoriasis.
- Nail pitting or joint pain suggests psoriasis.
- Severe itch, personal or family history of allergy suggests eczema.
- Fungal infection can look similar, so doctors may scrape the skin to check.
See a doctor urgently if
- Red, inflamed skin covering most of the body
- Fever with painful, weeping or crusted skin
- Clusters of painful blisters or punched-out sores (possible herpes infection on eczema)
- Swollen, painful joints with psoriasis
- Rash spreading quickly after starting a new medicine
In an emergency, call your local emergency number (in India: 108 or 112).
Frequently asked questions
Is psoriasis contagious?
No. Neither psoriasis nor eczema spreads from person to person.
Can stress make them worse?
Yes. Stress is a common trigger for flares of both conditions.
Should I use steroid creams from the chemist?
Only as prescribed. Long or unsupervised use can thin the skin and can make fungal infections worse if the rash is actually fungal.
Can psoriasis affect joints?
Yes. Some people develop psoriatic arthritis, with painful, swollen joints. Tell your doctor if your joints hurt.
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Not a diagnosis. This page gives general health information to help you talk to a doctor; it is not medical advice and does not replace an examination or tests. Do not start, stop or change any medicine without a qualified clinician. MedDroid is an AI medical assistant and can make mistakes. In an emergency, call your local emergency number (in India: 108 or 112).