Eczema is not one condition. It is a family of inflammatory skin conditions, and the National Eczema Association names seven types — with atopic dermatitis by far the most common. The forms differ in where they tend to appear, what they look like and what tends to aggravate them.

One thing this article will not do is tell you which type you have. Several forms can look alike, more than one can be present at the same time, and telling them apart is a job for a clinician who can examine your skin and ask the right questions. What a guide like this can do is map the landscape, so a professional conversation starts further along.

Key takeaways

  • Eczema is a group of conditions; atopic dermatitis is the most common form.
  • The main forms differ in typical location, appearance and aggravating factors — but they overlap, and more than one can occur at once.
  • Appearance also varies by skin tone within every type; "red" is not a reliable universal signal.
  • A distinctive pattern is a reason to describe it to a clinician, not a diagnosis.
  • Some forms, such as varicose eczema, need assessment because of what untreated disease can lead to.

Why "which type?" matters — and where the question ends

Knowing the forms is useful because care differs. Contact dermatitis improves when a triggering substance is found and avoided; varicose eczema involves circulation, not just skin; seborrheic dermatitis follows the oily areas of the body. Bringing a clear description of where symptoms appear and how they behave helps a clinician enormously.

But the question ends at description. If you recognize your experience below, treat that as vocabulary for an appointment — not as a conclusion.

Atopic dermatitis (atopic eczema)

The most common form, covered throughout this guide's introduction. The NHS describes itchy skin that can be dry, cracked, crusty, scaly or thickened and may blister or bleed. Depending on skin tone it can look red, white, purple or grey, or lighter or darker than surrounding skin. It affects all ages but is most common in young children.

Where it appears tends to shift with age, according to the dermatologist-reviewed American Academy of Dermatology: babies often develop it on the cheeks, forehead or scalp; children roughly from age two to puberty in the creases of elbows and knees, and on ankles, neck and wrists; adults more often on the hands, feet and around the eyes. After patches heal, skin may stay lighter or darker for a time, and on darker skin tones small rough bumps are more common — more on this in What Eczema Can Look Like on Different Skin Tones.

Contact dermatitis

Contact dermatitis is eczema triggered by contact with a particular substance, and the NHS separates two routes. Irritants — soaps and detergents, solvents, frequent contact with water — directly damage the skin's outer layer. Allergens — substances in some cosmetics, metals such as nickel, even some raw fruits and vegetables — set off an immune response.

The location is a clue: symptoms appear where the substance touched. On lighter skin the area can become red; on darker skin, dark brown, purple or grey. The encouraging part is the logic of care: identify and avoid the trigger, support the skin with emollients, and use topical corticosteroids for severe symptoms if prescribed. When the substance cannot be identified, a dermatologist can arrange further tests. If your symptoms seem tied to exposures, the pattern-tracking approach in Eczema Flare-Ups: Common Triggers applies directly.

Discoid eczema (nummular eczema)

Discoid eczema produces its name's shape: distinctive circular or oval patches. The NHS describes patches that often start swollen and blistered, oozing fluid, then become dry, crusty, cracked and flaky; sometimes the centre clears, leaving a ring. It can affect any part of the body, though usually not the face or scalp, and without treatment patches can persist for weeks, months or even years — often returning to previously affected spots.

One distinguishing note: unlike atopic eczema, discoid eczema does not seem to run in families.

Pompholyx (dyshidrotic eczema)

Pompholyx means intensely itchy blisters on the hands or feet that come and go — most often on the fingers and palms, sometimes the toes and soles. The NHS describes a typical sequence: itching with a burning or prickling feeling first, then small fluid-filled blisters, then dry, cracked, sore skin as they settle. Episodes usually last two to three weeks and recur.

Possible triggers overlap with other forms — strong chemicals, sensitivity to metals like nickel or cobalt, regularly wet hands, stress, heat and sweat. On black or brown skin, the blisters may look darker rather than the lighter tones often shown in photographs.

Seborrheic dermatitis

Seborrheic dermatitis follows the oily areas of the body: a scaly rash on the scalp and face, and sometimes the ears, eyebrows, beard area, around the nostrils or the chest, per the dermatologist-reviewed AAD. Two familiar conditions sit inside this category: dandruff can be considered its mildest form, and in infants it appears as cradle cap, which usually resolves on its own within months.

On lighter skin it tends to look red and raised; on darker skin, often pink, slightly purple, or lighter than the surrounding skin, and it can leave dark spots. Like other forms of eczema, it is not contagious.

Varicose eczema (stasis dermatitis)

Varicose eczema affects the lower legs and is common in people with varicose veins. The NHS explains the mechanism: when vein valves stop working properly, pressure rises and fluid can leak into the surrounding tissue, which can trigger a skin response. It appears red or brown on white skin, and dark brown, purple or grey on black or brown skin — where it can also be harder to see.

This is the form where assessment matters most urgently as a rule, because untreated varicose eczema can lead to leg ulcers. Persistent changes on the lower legs deserve a professional look even when they seem mild.

A seventh type, neurodermatitis, is on the NEA's list; it is not covered in detail here.

The forms at a glance

A six-panel overview of the main eczema types showing each form's typical body locations and one distinguishing feature, with a visible note that the chart describes patterns and is not a diagnostic tool.
Typical patterns, not a diagnosis. Several forms can look alike, and more than one can be present at once.
Type Where it often appears What to note
Atopic dermatitis Skin creases; face and scalp in babies; hands in adults Most common form; comes in flares and remissions
Contact dermatitis Wherever the substance touched Improves when the trigger is found and avoided
Discoid eczema Arms, legs, trunk — usually not face or scalp Distinct round or oval patches that can recur
Pompholyx Fingers, palms; sometimes toes and soles Very itchy blisters in episodes of a few weeks
Seborrheic dermatitis Scalp, face, ears, chest — oily areas Dandruff is its mildest form; cradle cap in infants
Varicose eczema Lower legs Linked to vein problems; needs assessment to prevent ulcers

The same caution belongs next to the table as at the top: this is vocabulary, not verdict.

When to seek assessment

See a clinician when symptoms persist, when the pattern is new or changing, or when anything on the lower legs suggests varicose eczema. Seek prompt medical help if skin becomes blistered or crusty, leaks fluid or develops pus-filled spots, feels painful, swollen or warm, suddenly worsens, or comes with a high fever — signs the NHS flags as possible infection.

Whichever form is eventually named, the fundamentals in the rest of this guide — gentle care, pattern awareness and knowing the urgent signs — remain the same starting point.

Sources

Source note: AAD states that its eczema content was developed by the organization and acknowledges support from Sanofi and Regeneron.

This article provides general educational information and is not a substitute for diagnosis or individualized advice from a qualified healthcare professional.