Atopic Dermatitis (Eczema): What It Is, Symptoms, and When to See a Doctor

Atopic dermatitis (eczema) is a chronic inflammatory skin disease whose hallmarks are intense itching and recurring patches of inflamed skin. Eczema is not an infection and does not spread from person to person through touch or contact; it is a condition tied to a person's own skin and immune response. It usually begins in childhood and may continue or return later in life, coming and going in flares that settle and then recur.

How common is eczema?

Eczema is one of the most common skin conditions worldwide. Scientific reviews indicate it affects roughly a quarter of children and about 5–10% of adults. In Saudi Arabia, estimates of adult prevalence across different provinces have ranged from about 6% to 13%, according to a national Saudi consensus statement published in the journal Dermatology and Therapy.

What causes eczema?

There is no single cause of eczema. Instead, the medical literature describes three main factors working together:

• Genetic susceptibility: an inherited tendency, often linked to a family history of eczema or allergies.
• Skin-barrier dysfunction: a weakness in the outer layer that holds in moisture and protects the skin, leaving it drier and more easily irritated.
• Immune dysregulation: an over-reactive immune response to environmental triggers.

Together, these factors help explain why affected skin tends to be dry, sensitive, and quick to become inflamed.

How do symptoms differ by age?

The most prominent symptom at every age is itching (pruritus), but the location of the rash typically shifts with age:

• Infants (under 2 years): patches usually appear on the cheeks, forehead, scalp, neck, and trunk, and on the outer (extensor) surfaces of the limbs.
• Older children, adolescents, and adults: the rash tends to favor the flexural folds, such as the inner elbows and behind the knees.

The condition is chronic or relapsing: it quiets down for periods and then flares again, with the skin often staying dry in between.

Is eczema linked to other conditions?

Eczema often occurs alongside other atopic conditions, including asthma, allergic rhinitis (hay fever), and certain food allergies. This is why a doctor considers the health history of the patient and their family. Not everyone with eczema develops these conditions.

What can trigger eczema flares?

Triggers vary from person to person. Among the most commonly cited in the medical literature:

• Non-specific irritants: sweat, saliva, and friction from rough clothing such as wool.
• Repeated scratching, which can make the condition worse.
• Some contact allergens: perfumes, cosmetics, certain metals, and plants.
• Airborne allergens: dust, dust mites, pollen, and animal dander.

Identifying and, where possible, avoiding your personal triggers is an important part of living with the condition.

How can you care for the skin day to day? (general education)

Daily skin care is a cornerstone of managing eczema. General principles noted in the medical literature include:

• Regular moisturizing with fragrance-free emollients that contain few ingredients, applied generously.
• Gentle cleansing with low-irritant products, rinsed off well.
• Avoiding long, very hot showers; lukewarm water is preferable.
• Wearing soft, cotton clothing and keeping nails trimmed to reduce the effect of scratching.

These general skin-care measures do not replace an individual medical assessment.

Is eczema contagious?

No. Eczema is not contagious. It does not spread through shaking hands, sharing items, swimming, or food. It is a condition tied to a person's own skin and immune system, so there is no need to worry about being around someone who has it.

When should you see a doctor?

It is sensible to see a dermatologist in situations such as:

• The diagnosis is unclear, or another skin condition is suspected.
• Symptoms persist or keep returning despite consistent home care.
• Signs of skin infection appear, such as weeping, crusting, or painful redness.
• Itching noticeably affects sleep, school, work, or quality of life.
• Eczema in children affects sensitive areas such as the face, or is accompanied by difficulties with growth or feeding.

The dermatologist chooses care and treatment options according to the person's age, the severity and location of the condition, and their health history.

The national Saudi consensus

The Saudi Ministry of Health initiated a multidisciplinary expert working group to review atopic dermatitis management and issue a national consensus statement aimed at standardizing care in the Kingdom.

This content was medically reviewed by Dr. Yousef Binamer — Dermatology, Avant Clinics. Review date: 16 July 2026.

Source: National Saudi consensus statement on the management of atopic dermatitis (2021), published in Dermatology and Therapy — DOI: 10.1007/s13555-022-00762-6

Frequently asked questions

Is eczema contagious?

No. Eczema is not contagious and does not spread through touch, shared items, or swimming. It is tied to a person's own skin and immune system.

Is eczema a chronic disease that can be fully cured?

Eczema is a chronic condition that tends to improve and flare in cycles. Its course varies between people, and a dermatologist assesses each case and sets an individual plan.

Why is eczema more common in children?

Eczema often begins in childhood due to a combination of genetic tendency, skin-barrier weakness, and immune response. In infants it appears on the cheeks, scalp, and limbs, and its location shifts as the child grows.

What is the difference between eczema and ordinary dry skin?

Ordinary dryness may improve with moisturizing, while eczema is a chronic skin inflammation with intense itching and recurring patches that may need medical assessment when it persists.