Is Eczema Genetic? What the Science Actually Says

Eczema — or atopic dermatitis — is not caused by a single gene switch that gets passed down in a simple pattern. It's a complex condition with both genetic and environmental contributors. But genetics matter significantly, and understanding them helps explain why some babies develop eczema while others in similar environments don't.

The Atopy Triad: Eczema, Asthma, and Allergies

"Atopy" refers to a genetic tendency to develop hypersensitivity reactions, which refer to the cluster of conditions that includes eczema, asthma, allergic rhinitis, and food allergies. These conditions frequently travel together in families and in individuals.

If one parent has atopy, a child's risk of developing at least one atopic condition is significantly elevated compared to families without this history. If both parents have atopic conditions, the risk rises further. This isn't a certainty since many children in high-risk families develop none of these conditions, but it does establish that family history is one of the most meaningful predictors of a child's risk.

The Filaggrin Gene: Why It Matters for Sensitive Skin

The clearest single genetic link to eczema is in the filaggrin (FLG) gene. Filaggrin is a structural protein that plays a critical role in how the outermost layer of the skin is formed and maintained.

Here's a simple way to understand its job.

Think of the skin surface as a brick wall. The skin cells are the bricks. Between them is a layer of specialized lipids — ceramides, fatty acids, and cholesterol — that functions as mortar, holding everything together and preventing moisture from escaping. Filaggrin helps produce both the structural proteins that form the bricks and the natural moisturizing factors that keep the mortar layer functional and intact.

When filaggrin is reduced or absent due to gene variants, the wall develops gaps. Moisture escapes more easily — a process called increased transepidermal water loss. Irritants, allergens, and bacteria penetrate the skin more readily. The immune system sitting just beneath the surface encounters things it wasn't meant to encounter, and responds with inflammation.

That inflammatory response is what we see as eczema.

Loss-of-function variants in the filaggrin gene are found in approximately 30 percent of people with eczema. These variants are strongly associated with earlier onset, greater severity, and higher risk of developing asthma and food allergies.

The key takeaway: There is a specific, well-characterized mechanism to sensitive skin being hereditary. And when you understand the mechanism, the path toward intervention becomes clearer.

 

What Happens Before Eczema Develops

One of the most important insights from eczema research in the last decade is this: barrier dysfunction comes before the inflammation, not after.

For a long time, the assumption was that eczema was primarily an immune problem — the inflamed skin was the core issue, and the barrier damage was a downstream consequence. More recent research has reversed that understanding. In children who go on to develop eczema, measurable barrier dysfunction — elevated transepidermal water loss, reduced skin lipid levels — is often present in the neonatal period, before any visible rash appears.

This means that in infants at higher genetic risk, the skin may be more permeable from birth. The question then becomes: can supporting that barrier early reduce what comes next?

 

The Case for Early Intervention: What the Research Shows

This is where the science becomes encouraging.

Several studies have examined whether applying moisturizer to high-risk newborns from the first days of life can reduce the likelihood of developing eczema. Research studies  have found that consistent, daily emollient application in higher-risk infants may improve skin barrier resilience and, in some studies, reduce eczema incidence compared to untreated controls.

The biological rationale is straightforward: if a leaky skin barrier is a precursor to atopic sensitization, supporting that barrier before allergen exposure begins may reduce the immune system's opportunity to develop the sensitization responses that lead to eczema and allergies.

Important context: this research is promising, not definitive. Not every study has shown the same magnitude of benefit, and early moisturization is not a guaranteed prevention strategy. It is, however, a low-risk, high-consistency intervention with a strong mechanistic rationale — and that's exactly the kind of evidence that informs proactive clinical decision-making.

The bottom line: if you have a family history of eczema or atopy, daily barrier support starting in the newborn period is a reasonable, evidence-informed approach. It won't eliminate genetic risk, but it may give your baby's skin the best possible starting conditions.

 

A Practical Newborn Skincare Protocol for High-Risk Families

If you're asking how to prevent eczema in a baby with family history, here is the approach I recommend that I also apply in my own practice.

Bathing

• Use lukewarm water only — hot water strips skin lipids and worsens barrier function

• Keep baths brief: 5 to 10 minutes is sufficient

• Use a gentle, fragrance-free cleanser sparingly — apply only where needed (skin folds, diaper area, hands)

• Pat dry with a soft towel; avoid rubbing

• Apply moisturizer within three minutes of bathing, while skin is still slightly damp — this is when absorption is highest and moisture retention is greatest

Fragrance Avoidance

This is non-negotiable for infants with a family history of atopy.

Fragrance is one of the most common contact allergens in eczema-prone skin, and it appears in more products than most parents realize — including many labeled "natural" or "gentle."

• Use fragrance-free laundry detergent for all clothing, bedding, and towels

• Avoid products containing essential oils (lavender, chamomile, eucalyptus, and tea tree are common skin sensitizers)

• Check wipes and bath products for methylisothiazolinone (MI), a preservative associated with contact dermatitis, particularly in the diaper area

Daily Barrier Moisturizer

Consistency matters more than any single product. The goal is daily application, not intermittent use when skin looks dry or irritated.

What to look for in a newborn barrier moisturizer:

• Fragrance-free and dye-free

• Contains ceramides to replenish intercellular lipids

• Contains beta-glucan for barrier-supportive and anti-inflammatory activity

• Free of essential oils, alcohols, and unnecessary preservatives

• Simple, transparent ingredient list

When to apply:

• Immediately after bathing (within three minutes)

• Once more before bed as part of a consistent evening routine

Environment

• Aim for indoor humidity between 45–55%, particularly in winter and in dry climates — a cool-mist humidifier in the baby's room supports skin hydration

• Use breathable, 100% cotton clothing and bedding; avoid synthetic fabrics and wool against the skin

• Wash all new clothing before use in fragrance-free detergent

 

Where by Dr. Mom Fits In

The by Dr. Mom product line at bydrmom.com was developed around exactly this philosophy — minimal, effective ingredients formulated for the most sensitive skin, including newborns in families with atopic history.

The Soothing Beta Cream and Hydrating Bath Soak are built around beta-glucan as a core active, alongside ceramides and barrier-supportive ingredients, without fragrance, essential oils, or unnecessary additives. They're designed to fit into the kind of consistent daily protocol described above — not as a cure or guaranteed prevention, but as physician-informed tools for building the best possible barrier environment from the beginning.

If you're looking for a starting point for a newborn skincare routine grounded in clinical evidence, these products reflect the same standard I apply in my own family.

 

When to Talk to Your Pediatrician

Start the conversation early — ideally before or just after birth if you have a strong family history of eczema or atopy. Your pediatrician can:

• Help you assess your baby's individual risk level

• Recommend whether a referral to a pediatric dermatologist or allergist is appropriate

• Guide decisions about timing of food introduction, which has its own evidence base in atopy prevention

• Monitor early skin signs and help distinguish normal newborn skin changes from early atopic dermatitis

 

The Bottom Line

Sensitive skin being hereditary is real, and filaggrin gene variants give us a clear biological explanation for why. But genetics aren't destiny. A more permeable skin barrier from birth is a starting condition — not an inevitable outcome.

The research on early moisturization in high-risk infants is genuinely encouraging. Daily, consistent barrier support using fragrance-free, evidence-based products — started from the newborn period — is one of the most actionable things parents with a family history of eczema can do.

Start simple. Bathe briefly in lukewarm water. Apply a ceramide- and beta-glucan-containing cream within three minutes. Eliminate fragrance across the entire routine. Do it every day.

The skin barrier responds to consistent care. Give it the support it needs from the beginning.

REFERENCES:

latz, M., Jo, J.-H., Kennedy, E. A., Polley, E. C., Segre, J. A., Simpson, E. L., & Kong, H. H. (2018). Emollient use alters skin barrier and microbes in infants at risk for developing atopic dermatitis. PLOS ONE, 13(2), e0192443. https://doi.org/10.1371/journal.pone.0192443

Bradshaw, L. E., Wyatt, L. A., Brown, S. J., et al. (2024). Emollient application from birth to prevent eczema in high-risk children: The BEEP RCT. National Institute for Health and Care Research. https://www.ncbi.nlm.nih.gov/books/NBK605001/