Eczema in Babies and Food Allergies
A Comprehensive Guide to Infant Eczema and Allergy Risk
Evidence-based guidance from the London Allergy and Immunology Centre
What is eczema in babies?
Eczema, also known as atopic dermatitis, is a common inflammatory skin condition affecting up to 20% of infants. It typically presents as dry, itchy, inflamed skin on the cheeks, scalp, arms, or legs within the first months of life.
There is a strong clinical association between eczema and the later development of food allergies, particularly in infants with early or severe disease.
The Link Between Eczema and Food Allergies
Skin Barrier Dysfunction
The dual allergen exposure hypothesis explains how allergens may enter the body through damaged skin, leading to immune sensitisation before food is ever eaten.
Key mechanisms:
✓ Environmental food proteins penetrate damaged skin
✓ The immune system recognises them as harmful
✓ Sensitisation develops prior to ingestion
Infants with eczema before 3 months of age may have up to a 50% higher risk of developing allergies to foods such as egg, peanut, and sesame.
Genetic Factors
Genetic predisposition plays an important role. Mutations in the filaggrin gene, essential for maintaining skin barrier integrity, are strongly associated with eczema and allergic sensitisation.
Large-scale research programmes continue to investigate how genetic and environmental factors interact in early-life allergy development.
Management of Eczema in Infants
Effective eczema management is essential not only for symptom control but also for reducing allergy risk.
Skin Care and Moisturising
Regular use of emollients improves hydration and reduces irritation. However, recent clinical evidence suggests moisturisers alone do not prevent eczema or food allergies.
Clinical findings:
• No significant prevention of eczema
• Increased risk of skin infection reported
• Possible increased risk of food allergy
Important Safety Advice
Avoid moisturisers containing food-derived ingredients, as they may increase sensitisation risk through broken skin:
✓ Nut oils
✓ Dairy proteins
✓ Oat extracts
Dietary Prevention Strategies
Early Introduction of Allergenic Foods
Introducing allergenic foods such as peanut and egg between 4–6 months of age can significantly reduce allergy risk, particularly in high-risk infants.
Evidence-based benefit:
Early introduction may reduce peanut allergy risk by up to 80%.
Infants with moderate to severe eczema should be assessed by a specialist before introducing allergenic foods.
Recent Clinical Research
SEAL Trial
Investigating whether proactive eczema treatment in early infancy can reduce food allergy development through improved skin barrier function.
PACI Study
Demonstrated that proactive treatment of both affected and unaffected skin reduced egg allergy risk by approximately 25%.
Systematic Reviews
Large reviews confirm that eczema management remains essential, but moisturisers alone are insufficient for prevention.
Practical Advice for Parents
✓ Use warm water
✓ Limit to ~10 minutes
✓ Use fragrance-free cleansers
✓ Soft cotton fabrics
✓ Avoid wool and synthetics
✓ Avoid food-based creams
✓ Use medical-grade emollients
✓ Regular clinical review
✓ Safe steroid use monitoring
Future Developments
Biologic Therapies
Emerging targeted treatments are improving outcomes in moderate to severe eczema.
Microbiome Research
Ongoing studies are exploring how gut bacteria influence immune tolerance and allergy prevention.
Key Takeaways
✓ Early eczema management protects the skin barrier
✓ Eczema increases food allergy risk
✓ Early allergen introduction reduces risk
✓ Avoid food-based skincare products
✓ Specialist assessment improves outcomes
Last updated: March 2026