Dermatology
Eczema vs. Psoriasis: How to Tell the Difference
Published · Haute MD Editorial Team
Eczema (most often atopic dermatitis) and psoriasis are both chronic, non-contagious inflammatory skin diseases, but they usually look, feel and behave differently. Eczema tends to cause intensely itchy patches with blurry edges in skin creases, such as the inner elbows and behind the knees, and usually starts in childhood. Psoriasis tends to cause thick, raised, sharply outlined plaques, often with silvery-white scale, on the outer elbows, knees, scalp and lower back; it is more common in adults, can affect the nails, and is linked to psoriatic arthritis. The two can overlap, and a person can have both, so a dermatologist's exam (occasionally a skin biopsy) is the reliable way to tell them apart. That matters because some treatments, especially biologics, work for one condition and not the other.
At a glance
What it is: Eczema: Chronic inflammatory skin disease with a weakened skin barrier; part of the "atopic" family with asthma and hay fever. Psoriasis: Chronic immune-mediated disease in which skin cells build up too quickly. Contagious: Eczema: No. Psoriasis: No. Typical look: Eczema: Red, dry, scaly patches with ill-defined borders; can ooze and crust. On darker skin, may look dark brown, purple or gray, with small rough bumps. Psoriasis: Thick, raised, well-defined plaques, often covered with silvery-white scale. Can look red or discolored. Typical location: Eczema: Skin folds: inner elbows, behind knees, neck, wrists, ankles; face and scalp in infants; hands and around the eyes in adults. Psoriasis: Outer elbows, knees, scalp, lower back; also palms and soles. Nails can pit. Itch: Eczema: Usually intense, often worse at night. Psoriasis: Can itch, burn or sting; itch is often milder. Usual age of onset: Eczema: Childhood: 80% of people with atopic dermatitis have onset before age 6 (NEA); adult onset happens too. Psoriasis: Can start at any age; more common in adults. Related conditions: Eczema: Asthma, hay fever, food allergies; skin infections. Psoriasis: Psoriatic arthritis (about 30% of people with psoriasis, NPF); heart disease and depression risk. U.S. prevalence: Eczema: About 31.6 million people have some form of eczema (NEA). Psoriasis: More than 8 million people (NPF). Sources: NIAMS (atopic dermatitis, last reviewed Nov. 2022; psoriasis, last reviewed Oct. 2023); American Academy of Dermatology; National Eczema Association; National Psoriasis Foundation. Checked Oct. 25, 2026.
Why they get confused
At first glance both can look like dry, red, scaly patches, and both come and go in flares. The American Academy of Dermatology notes that in children it isn't always easy to tell them apart; an Australian study it cites found most children with psoriasis were first diagnosed by their primary care doctor with another condition, often eczema. Some people have features of both, which a dermatologist may call "psoriasiform dermatitis," and some people have both diseases. Location can mislead, too. One type of psoriasis, inverse psoriasis, appears as smooth red patches in skin folds such as the armpits, groin or under the breasts (NIAMS), exactly where eczema is common.
How to tell them apart
Edges: eczema patches tend to have blurry, ill-defined borders; psoriasis plaques tend to be sharply demarcated (NEA). Thickness and scale: psoriasis plaques are usually thicker and more raised, often with silvery-white scale. Eczema scaling is usually mild, and the skin may weep, ooze or crust (NEA). Where it shows up: eczema favors the inside of joints (crooks of elbows and knees); psoriasis favors the outside (elbows, knees), plus the scalp and lower back (AAD; NEA). Itch: both can itch, but eczema itch is typically intense; psoriasis may itch, burn or sting (NEA; NIAMS). Nails: pitting, discoloration, crumbling or lifting of the nails points to psoriasis. About half of people with plaque psoriasis get nail signs at some point (AAD). Joints: pain, swelling or stiffness in joints alongside a rash raises the question of psoriatic arthritis. History: a personal or family history of eczema, asthma or hay fever points toward atopic dermatitis. A family history of psoriasis raises psoriasis risk (AAD). Skin tone matters. On lighter skin, atopic dermatitis is usually red; on darker skin it may look dark brown, purple or grayish, often with small, rough bumps (AAD). The National Psoriasis Foundation says psoriasis is likely underdiagnosed in people with skin of color because it can present differently.
What's happening underneath
Both are immune-driven, but through different pathways. In atopic dermatitis, a weakened skin barrier (some people carry changes in the filaggrin gene) lets irritants and allergens in, and the immune response is largely an allergic, Th2-type inflammation. Psoriasis is driven by different immune cells, chiefly Th1 and Th17 cells, which makes skin cells multiply too quickly and pile up into plaques (NIAMS; NEA). That difference is why some targeted drugs work for one disease and not the other.
Common triggers
Eczema: Irritants such as soaps, detergents, some perfumes and cosmetics, cigarette smoke (NIAMS). Psoriasis: Infections, including strep throat (NIAMS). Eczema: Allergens such as dust, pet dander and pollen (NEA). Psoriasis: Certain medications (NIAMS). Eczema: Stress, which can worsen both conditions (NEA). Psoriasis: Smoking and obesity, which worsen psoriasis (NIAMS); stress, alcohol and weather (NPF).
How each is diagnosed
There is no single blood test for either. Diagnosis rests on a skin exam and your medical and family history. For atopic dermatitis, a doctor may order blood tests to rule out other causes or a skin biopsy, and may need several visits to be sure (NIAMS). For psoriasis, the doctor examines the skin, scalp and nails and may take a small skin sample to rule out look-alikes (NIAMS).
How treatment differs
Neither condition has a cure, but both can usually be controlled. Some treatments overlap, including topical corticosteroids and phototherapy (ultraviolet light). Eczema (atopic dermatitis), per NIAMS: Moisturizers to restore the skin barrier, applied right after bathing. Topical corticosteroids; topical calcineurin inhibitors; a topical PDE4 inhibitor. For more severe disease: JAK-inhibitor pills (with close monitoring) and an injectable biologic. Oral corticosteroids usually aren't prescribed, because eczema can rebound worse after stopping. Phototherapy for severe, widespread eczema; antibiotics if the skin becomes infected. Psoriasis, per NIAMS: Topicals: corticosteroids, vitamin D-based medicines, retinoids, coal tar, anthralin, PDE4 inhibitors and aryl hydrocarbon receptor (AhR) activators. Phototherapy, usually when large areas are affected. Systemic options for moderate to severe disease: methotrexate, oral retinoids, injectable biologics, immunosuppressants, oral PDE4 inhibitors and oral TYK2 inhibitors. Why the right diagnosis matters: biologics target condition-specific pathways, so a biologic approved for psoriasis generally isn't a treatment for eczema, and vice versa (NEA).
When to see a dermatologist
A rash that isn't improving with gentle skin care and over-the-counter products. Itch that disrupts sleep. Signs of infection: oozing, crusting, pain or fever. Thick, scaly plaques, nail changes or joint pain or stiffness. You're unsure which condition you have, or you're considering systemic medicine. Atopic dermatitis may also be managed by allergists and primary care doctors; psoriatic arthritis is treated with a rheumatologist (NIAMS).
Questions to ask at your appointment
Is this eczema, psoriasis, both or something else? How sure are you, and would a biopsy help? What type and severity is it? Which triggers should I watch for? What's the plan if topical treatment isn't enough? If you suggest a pill, injection or light therapy, what monitoring does it need? Should I be screened for psoriatic arthritis, asthma or allergies?
Find a dermatologist
Browse Dermatology in the Haute MD directory, or start at Find a Doctor. Featured doctors: Dr. Anna Chacon, a board-certified dermatologist at Miami Derm in Miami whose practice treats skin concerns including psoriasis and eczema, in person and through teledermatology; and Dr. Akhil Gupta, a board-certified dermatologist at Skin Center of Florida in North Palm Beach whose practice includes general and complex dermatology and dermatologic care for skin of color. Haute MD members are featured through paid membership. Membership is not an endorsement or a ranking.
Sources
1. National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), "Atopic Dermatitis" (last reviewed Nov. 2022). https://www.niams.nih.gov/health-topics/atopic-dermatitis (fetched 2026-10-25). 2. NIAMS, "Atopic Dermatitis: Diagnosis, Treatment, and Steps to Take" (last reviewed Nov. 2022). https://www.niams.nih.gov/health-topics/atopic-dermatitis/diagnosis-treatment-and-steps-to-take (fetched 2026-10-25). 3. NIAMS, "Psoriasis" (last reviewed Oct. 2023). https://www.niams.nih.gov/health-topics/psoriasis (fetched 2026-10-25). 4. NIAMS, "Psoriasis: Diagnosis, Treatment, and Steps to Take" (last reviewed Oct. 2023). https://www.niams.nih.gov/health-topics/psoriasis/diagnosis-treatment-and-steps-to-take (fetched 2026-10-25). 5. American Academy of Dermatology, "What's the difference between eczema and psoriasis?" https://www.aad.org/public/diseases/eczema/childhood/child-have/difference-psoriasis (fetched 2026-10-25). 6. American Academy of Dermatology, "Eczema types: Atopic dermatitis symptoms." https://www.aad.org/public/diseases/eczema/types/atopic-dermatitis/symptoms (fetched 2026-10-25). 7. American Academy of Dermatology, "Psoriasis: Signs and symptoms." https://www.aad.org/public/diseases/psoriasis/what/symptoms (fetched 2026-10-25). 8. American Academy of Dermatology, "How could I have gotten psoriasis?" https://www.aad.org/public/diseases/psoriasis/treatment/could-have/how-gotten (fetched 2026-10-25). 9. National Eczema Association, "Is it Eczema or Psoriasis?" (Oct. 7, 2022). https://nationaleczema.org/blog/eczema-or-psoriasis/ (fetched 2026-10-25). 10. National Eczema Association, "Eczema Facts." https://nationaleczema.org/eczema-facts/ (fetched 2026-10-25). 11. National Psoriasis Foundation, "Psoriasis Statistics." https://www.psoriasis.org/psoriasis-statistics/ (fetched 2026-10-25). 12. National Psoriasis Foundation, "About Psoriasis." https://www.psoriasis.org/about-psoriasis/ (fetched 2026-10-25).
Medical disclaimer
This page is for general education and is not medical advice. Talk with a board-certified dermatologist about your skin.
Frequently Asked Questions
What is the main difference between eczema and psoriasis?
Eczema is typically an intensely itchy rash with blurry edges in skin creases that usually starts in childhood. Psoriasis typically forms thick, sharply outlined, scaly plaques on the outer elbows, knees, scalp and lower back, is more common in adults, and can affect nails and joints.
Is psoriasis or eczema contagious?
No. Neither can be caught from another person (NIAMS; AAD; NPF).
Which is itchier, eczema or psoriasis?
Eczema itch is usually more intense and often disrupts sleep. Psoriasis can itch too, but it may feel more like burning or stinging.
Can you have eczema and psoriasis at the same time?
Yes, though it's relatively uncommon. Some rashes also have features of both, which dermatologists may call psoriasiform dermatitis.
Can eczema turn into psoriasis?
They are distinct diseases driven by different immune pathways (NEA). What happens more often is that a rash first labeled eczema turns out to be psoriasis (AAD), which is why a dermatologist's diagnosis matters.
Does psoriasis look different on darker skin?
It can. Psoriasis may look discolored rather than red, and the National Psoriasis Foundation says it is likely underdiagnosed in people with skin of color.
Are eczema and psoriasis treated the same way?
Partly. Topical corticosteroids and light therapy are used for both, but many prescription treatments, including biologics, are specific to one condition.
Can either be cured?
No, but both can usually be controlled with treatment, and many children with eczema improve as they grow older (NEA).
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