Eczema and Primary Immunodeficiency: Is There a Connection?

For some people with primary immunodeficiency (PI), eczema is connected to the immune system — not just the skin. If eczema shows up with frequent infections or looks different from typical eczema, it may be part of a bigger picture.

PI — also called inborn errors of immunity (IEI) — can happen alongside eczema and eczemalike symptoms. This article explores the links and tells you what skin symptoms to watch out for if you have PI.

What Is Eczema?

Eczema is a common skin condition, affecting more than 31 million people in the United States. Symptoms often include:

• Dry skin
• Itching
• Rash
• Bumps
• Flaky or crusty skin
• Thickened patches of skin
• Swelling

Eczema is a broad term for several types of skin inflammation, or dermatitis, that can affect the skin’s barrier. Atopic dermatitis is the most common type of eczema, so the two terms are sometimes used together. It isn’t contagious, and it can affect people of any age.

What’s the Link Between Eczema and Primary Immunodeficiency?

For many people, eczema is caused by a mix of genetics, skin barrier changes, immune system activity, and triggers such as:

• Specific soaps or beauty products
• Allergens
• Stress
• Dry air
• Certain fabrics
• Food allergies

Some people with PI may also develop eczemalike rashes. In these cases, the skin symptoms may happen because the immune system isn’t working in a balanced way. The same immune problem that raises the risk of infections may also lead to inflammation, allergies, or changes in the skin barrier.

Can Eczema Be the First Sign of Primary Immunodeficiency?

Sometimes, yes. Eczemalike dermatitis can be an early sign of certain primary immunodeficiency conditions. It may be the first sign that brings someone to a dermatologist.

That said, most people with eczema don’t have PI. Doctors usually look for a pattern. Eczema may be more concerning when it appears with other clues, such as:

• Repeated or unusual infections
• Poor growth in children
• Bleeding problems
• Severe allergies
• Chronic diarrhea

Which Primary Immunodeficiency Conditions Are Linked to Eczema?

Several PI conditions can involve eczemalike skin symptoms. Some of the best-known examples include:

• Wiskott-Aldrich syndrome (WAS)
• STAT3 hyper IgE syndrome
• DOCK8 deficiency
• PGM3 deficiency
• Immune dysregulation, polyendocrinopathy and enteropathy, X-linked (IPEX) syndrome
• Mammalian sterile 20-like protein 1 (MST1) deficiency
• Omenn syndrome (RAG1/2 deficiency)

Wiskott-Aldrich Syndrome

WAS is a rare PI disease that can cause eczema, infections, bleeding problems, and certain cancers, such as lymphoma. It’s inherited in an X-linked recessive pattern, which means it mostly affects males.

A key clue to WAS is a low platelet count. Platelets help blood clot, so people with Wiskott-Aldrich syndrome may bruise easily, have tiny red or purple spots on the skin, or have bleeding symptoms along with eczema and infections.

STAT3 Hyper IgE Syndrome

STAT3 hyper IgE syndrome is a PI linked to high levels of immunoglobulin E (IgE), an antibody involved in allergic responses. This condition can cause eczema, recurrent skin infections, lung infections, and other features outside the immune system.

Skin symptoms may begin in the newborn period as a rash and later look more like eczema. Other clues may include recurrent boils, pneumonia, yeast infections in the mouth or skin, retained baby teeth, scoliosis, or fractures after minor injury.

DOCK8 Deficiency

DOCK8 deficiency is a combined immunodeficiency, which means it can affect more than one part of the immune system. Like WAS, it can involve eczema, combined immunodeficiency, and a higher chance of autoimmune problems and cancers.

DOCK8 deficiency is often linked with:

• Severe viral skin infections
• Food allergies
• Asthma
• High IgE levels
• Recurrent lung or skin infections

PGM3 Deficiency

PGM3 deficiency is a rare inherited immune disorder that may cause eczemalike skin symptoms, frequent infections, allergies, and high levels of IgE.

People with PGM3 deficiency may also have symptoms outside the skin, such as asthma, developmental delays, low white blood cell counts, or problems affecting growth or the skeleton. These added symptoms can help doctors tell PGM3 deficiency apart from typical eczema.

Other Rare PI Conditions

Some rarer immune conditions can cause severe eczema very early in life. IPEX syndrome, for example, may involve eczema along with autoimmune problems, chronic diarrhea, and hormone-related conditions such as type 1 diabetes.

Other rare genetic immune conditions, including MST1 deficiency, may present with eczema, multiple infections, and heart abnormalities.

Omenn syndrome is another rare combined immunodeficiency that presents with extensive erythroderma (discolored skin rashes), failure to thrive, alopecia (hair loss), and severe, recurrent infections

How Is Typical Eczema Different From PI-Related Eczema?

Typical eczema often starts in childhood, comes and goes, and improves with a consistent skin care plan. Common care steps include regular moisturizing, avoiding triggers, using gentle skin products, and applying prescription creams or ointments when needed.

Eczema that may need immune-system evaluation often has extra warning signs. Talk with a healthcare provider about a possible PI evaluation if you have eczema and:

• Frequent infections — Ear infections, sinus infections, pneumonia, skin abscesses, or infections that keep coming back
• Unusual infections — Infections caused by germs that don’t usually make healthy people sick
• Severe infections — Infections that need IV antibiotics, hospital care, or take a long time to clear
• Poor treatment response — Eczema that doesn’t improve after several weeks of recommended treatment
• Skin infections — Weeping, crusting, pain, swelling, fever, pus, or repeated infected eczema
• Other immune symptoms — Autoimmunity, swollen lymph nodes, enlarged spleen, chronic diarrhea, poor growth, or weight loss
• Family history — Relatives with PI, unexplained severe infections, or similar symptoms

How Is Primary Immunodeficiency Diagnosed in People With Eczema?

Evaluation usually starts with a detailed health history and physical exam. A healthcare provider may ask:

• When the eczema symptoms started
• How severe it is
• What treatments have been tried
• Whether infections are frequent
• Whether there are symptoms in the lungs, gut, blood, or other parts of the body

Doctors also look at the type of infections. Immunodeficiency is more likely when infections are:

• Severe
• Complicated
• In several body areas
• Hard to treat
• Caused by unusual organisms
• Present in family members

Testing may include:

• Complete blood count — This checks white blood cells, red blood cells, and platelets. Low platelets may raise concern for Wiskott-Aldrich syndrome.
• Immunoglobulin levels — These blood tests measure antibodies such as IgG, IgA, IgM, and often IgE.
• Vaccine response testing — This checks whether the immune system makes protective antibodies after vaccines.
• Lymphocyte subset testing — This measures types of immune cells, including T cells, B cells, and natural killer cells.
• Skin testing or allergy evaluation — This may help identify allergic triggers, when appropriate.
• Genetic testing — This may be used when the symptom pattern suggests a specific inherited immune condition.

Not everyone with eczema needs these tests. An allergist, immunologist, dermatologist, or primary care provider can help decide whether testing makes sense.

How Does Diagnosis Change Treatment?

Finding PI can change an eczema treatment plan. Eczema care may still include moisturizers, trigger avoidance, and prescription treatments. But doctors may also focus on preventing and treating infections, monitoring for complications, and choosing medications carefully.

PI-targeted treatment may include:

• Antibiotics to prevent infections
• Immunoglobulin replacement therapy
• Antiviral treatment
• Antifungal treatment
• Other immune-focused care

In some severe PI conditions, a hematopoietic stem cell transplant may be considered. Stem cell transplant can be curative for many people with Wiskott-Aldrich syndrome or DOCK8 deficiency, though treatment decisions depend on the specific condition and severity.

Diagnosis also helps doctors avoid treatments that could cause problems. For example, strong immunosuppressant medicines may not be the right choice for some people with untreated or unrecognized immune deficiency. A specialist can help balance eczema control with infection risk.

What Should You Do if You Have PI and Eczema Symptoms?

Worsening or new skin changes are worth discussing with your PI care team.

Call your healthcare provider if you notice:

• Skin pain, warmth, swelling, pus, or yellow crusting

• Fever or chills with a rash

• Blisters, open sores, or rapidly spreading rash

• Eczema that doesn’t improve with your usual treatment plan

• New warts, molluscum (an infection that causes growths on the skin), herpeslike sores, or frequent skin infections

• A rash after starting a new medication or treatment

Don’t stop PI treatments or eczema medicines without checking with your doctor. Bring photos of your rash, a list of recent infections, and a list of treatments you’ve tried. These details can help your care team decide whether you need a skin swab, blood work, a biopsy, allergy testing, or a change in treatment.

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