Compare · Conditions

Nummular Eczema vs Pityriasis Rosea

Discoid eczema produces round or oval itchy eczema patches. A usually temporary eruption of oval scaly patches, sometimes beginning with one larger herald patch.

Research updated 2026-10-23
Nummular EczemaOval patches with fine collarette scale on the upper back.
Key differencesWhat is it?What it looks likeDiagramsWhen it startsTriggersDaily CareTreatmentOutlookComplicationsWhen to get helpQuestions

Key differences

The same eight facts on every condition comparison.

Usual age
Adults
10 to 35
Where
Arms, legs, hands
Trunk and upper arms
Main sign
Coin-shaped eczema patches
Herald patch, then oval scaly patches
Itch or pain
Very itchy
Mild itch
Contagious
No
Not really
Long term
Often comes back
Clears in 6 to 12 weeks
Scars
No; may leave marks
No
Who gets it
Adults with dry skin
Teens and young adults

What is it?

Nummular Eczema
Pityriasis Rosea
What is it?
  • What it is
    Discoid eczema produces round or oval itchy eczema patches.
  • What it is
    A usually temporary eruption of oval scaly patches, sometimes beginning with one larger herald patch.

What it looks like

Nummular Eczema

A lower leg with one coin-shaped red plaque covered in pale scale.

Nummular Eczema A clearly outlined red patch has a dry, rough surface.

Pityriasis Rosea

An upper back with one larger dusky oval patch and multiple smaller pink patches.

Larger patch and smaller spots A larger patch sits among several smaller pink marks.

Oval rash patches slope outward from the spine in a branching pattern.

Branching back pattern Oval patches follow sloping lines across the back in a branching pattern.

Skin tones
Nummular Eczema on light skin.
Nummular Eczema.
Nummular Eczema.
Nummular Eczema.
Oval patches with fine collarette scale on the upper back.
Oval patches with fine collarette scale on the upper back.
Oval patches with fine collarette scale on the upper back.
Oval patches with fine collarette scale on the upper back.
In the skin

Inflammation develops in patches of dry or damaged skin. The resulting coin-shaped areas are an eczema pattern rather than a fungal infection themselves.

An inflammatory skin eruption develops for reasons that are not fully understood. A viral association is suspected, but the exact cause remains uncertain.

When it usually starts

010203040506070+

Nummular Eczema. Can occur at different ages; many cases develop in adults.

Pityriasis Rosea. Most often affects adolescents and young adults.

Causes and triggers

Causes

Inflammation develops in dry or damaged skin; it is not itself a fungal infection.

The exact cause is uncertain; a viral association is suspected.

Risk factors
Dry skin, Skin injury
Adolescence or young adulthood
Trigger
● Nummular Eczema
● Pityriasis Rosea
Dryness
Can contribute
Not listed
Skin injury
Can contribute
Not listed
Irritants
Can contribute
Not listed
No established short-term flare trigger
Not listed
Not a typical trigger

Daily Care

Nummular Eczema
Pityriasis Rosea
Daily care

Habits that help

  • Apply fragrance-free moisturizer often and after washing
    Use a plain cream or ointment that does not sting.
  • Wash with lukewarm water and a mild cleanser
    Pat dry gently and keep necessary hand hygiene without unnecessary repeated washing.
  • Protect skin during wet work and cleaning
    Use suitable protective gloves; cotton liners and breaks help prevent trapped sweat.
  • Use a cool damp compress for short-term itch relief
    Keep nails short and protect sore skin from rubbing.
  • Moisturize the surrounding dry skin as well as the patches
    Protect against minor injuries and seek review for crusting, oozing or a rash not responding as expected.

Avoid

  • Avoid: Fragrance, harsh detergents and known triggers
    Read labels rather than assuming a natural or unscented product is safe.
  • Avoid: Picking, scratching or deliberately popping blisters
    Broken skin increases pain and infection risk.

Habits that help

  • Moisturize dry or itchy areas with a plain cream
    Fragrance-free products are less likely to sting inflamed skin.
  • Keep baths and showers brief and lukewarm
    Gentle washing is usually more comfortable than hot water and scrubbing.
  • Wear loose, breathable clothing
    Reduce overheating and friction if they worsen itch.
  • Use a cool damp cloth for itch relief
    Keep nails short and avoid scratching the rash.
  • Arrange review if the diagnosis is uncertain or you are pregnant
    A similar-looking rash may need testing, and pregnancy changes the assessment.

Avoid

  • Avoid: Deliberate tanning or burning to clear the rash
    Sunburn adds skin injury; discuss any light treatment with a clinician.

Treatment differences

Evidence labels come from each condition’s own treatment list.

Treatment
● Nummular Eczema
● Pityriasis Rosea
Prescription topicals

Site-appropriate topical corticosteroid

Listed

Treats active eczema for a clinician-directed course; strength depends on site and age.

Symptom-directed treatment

Listed

A clinician may recommend an appropriate topical anti-inflammatory if itch is troublesome.

Outlook

Long term

Discoid eczema can settle with treatment but often returns, particularly with dry skin or cold weather. Some cases eventually resolve; recurring patches may need maintenance care.

The rash usually clears on its own in about 6–10 weeks. Color changes can last longer, particularly after inflammation; another episode is uncommon.

Complications

Possible complications

Cracked skin may become infected; repeated exposure can make the rash persistent.

Pigment changes may persist after the rash. Pregnancy warrants discussion with a clinician.

When to get help

When to get help

Seek assessment if ringworm is possible, patches ooze or crust, or treatment does not help.

Seek assessment for a first unexplained rash, pregnancy, mouth or genital lesions, or an unwell feeling.

Common questions

Nummular Eczema:What is Nummular Eczema?

Discoid eczema produces round or oval itchy eczema patches.

Nummular Eczema:What can I do day to day?

Use bland fragrance-free moisturizer and avoid the suspected irritant. Protect skin from repeated wetting.

Nummular Eczema:When should I get medical advice?

Seek assessment if ringworm is possible, patches ooze or crust, or treatment does not help.

Pityriasis Rosea:What is Pityriasis Rosea?

A usually temporary eruption of oval scaly patches, sometimes beginning with one larger herald patch.

Pityriasis Rosea:What can I do day to day?

Use gentle washing and moisturizer; avoid overheating if it worsens itch.

Pityriasis Rosea:When should I get medical advice?

Seek assessment for a first unexplained rash, pregnancy, mouth or genital lesions, or an unwell feeling.

Sources

Sources and further reading

  1. Discoid eczema
  2. Pityriasis rosea
Dermapedia on YouTube