Nummular Dermatitis vs Atopic Dermatitis: Know the Differences

Nummular Dermatitis vs Atopic Dermatitis: Nummular Dermatitis is characterised by coin-formed lesions on the skin, regularly observed on the arms and legs. Its specific cause is unknown but is related to elements like dry skin, irritants, and allergies. Triggers include dry air, harsh soaps, and pressure. Treatment typically involves moisturizing the skin, avoiding triggers, and the usage of topical steroids. Atopic Dermatitis, on the other hand, causes crimson, itchy patches of skin, normally in flexural areas like elbows and knees, and is believed to stem from genetic and environmental factors inclusive of a compromised skin barrier and immune gadget abnormalities, with treatments specializing in moisturization, cause avoidance, and often topical corticosteroids or calcineurin inhibitors.

Difference between Nummular Dermatitis and Atopic Dermatitis

Nummular Dermatitis is defined by coin-fashioned lesions caused with the aid of dryness, controlled with moisturizers and topical steroids. Atopic Dermatitis is the purple, itchy patches, often in flexural regions, controlled further with moisturization and topical remedies. The table below provides the differences between Nummular Dermatitis and Atopic Dermatitis.


Nummular Dermatitis

Atopic Dermatitis


Coin-shaped patches of irritated skin

A chronic inflammatory skin condition characterized by itchy, inflamed skin


Typically found on extremities such as arms and legs

Commonly affects flexural areas but can occur on any part of the body


Round or oval patches, often with distinct borders

Dry, scaly patches of skin, can also include redness, swelling, and cracking


Intense itching may or may not be present

Itching is a prominent symptom

Age of onset

More common in adults, particularly in individuals aged 30-50

Commonly begins in infancy or childhood, but can persist into adulthood

Associated conditions

No specific associations, although it may coexist with other skin conditions

Often associated with other allergic conditions such as asthma or hay fever


Topical corticosteroids, moisturizers, and antihistamines for itching relief

Emollients, topical corticosteroids, immunosuppressants, and antihistamines; may require systemic treatments in severe cases


Typically resolves with treatment, but may recur

Can be chronic and may require long-term management

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What is Nummular Dermatitis?

Nummular Dermatitis can be defined as an inflammatory pores and skin condition characterized with the aid of the presence of round or coin-formed lesions at the pores and skin. These lesions may be crimson, scaly, and itchy, and they frequently arise on the arms and legs. The precise reason for Nummular Dermatitis is unknown, however, it's miles believed to be associated with elements which include dry pores and skin, irritants, hypersensitive reactions, and genetic predisposition. 

Causes of Nummular Dermatitis

  • Dry Skin: Individuals with dry pores and skin can be extra vulnerable to growing Nummular Dermatitis. Dry skin can result in compromised pores and skin barrier, making it simpler for irritants and allergens to penetrate the skin and cause inflammation.
  • Environmental Factors: Exposure to harsh environmental situations, consisting as cold weather or low humidity, can exacerbate Nummular Dermatitis. Dry air can similarly dehydrate the skin, main to infection and irritation.
  • Skin Trauma: Skin injuries, together with cuts, scrapes, or insect bites, can trigger Nummular Dermatitis lesions. The damaged skin may also come to be infected and extra susceptible to growing function coin-formed patches.
  • Allergens and Irritants: Contact with certain allergens or irritants, such as chemical compounds in soaps, detergents, or skincare products, can initiate an immune response in prone people, leading to Nummular Dermatitis flare-ups.

Symptoms of Nummular Dermatitis

  • Coin-fashioned Lesions: The hallmark symptom of Nummular Dermatitis is the presence of spherical or oval-formed patches of angry skin. These lesions often resemble coins, hence the name "nummular, which means "coin" in Latin.
  • Redness: The affected skin may also seem pink or crimson, indicating irritation and inflammation.
  • Scaling: The patches of pores and skin laid low with Nummular Dermatitis may come to be dry, scaly, and flaky. This scaling is regularly mentioned around the rims of the lesions.
  • Itching: Nummular Dermatitis is generally accompanied with the aid of extreme itching, which can vary from moderate to severe. Scratching the affected regions can exacerbate the irritation and lead to similar inflammation.
  • Burning or Stinging Sensation: Some people with Nummular Dermatitis may experience a burning or stinging sensation within the affected skin, specifically when the lesions are aggravated or come into contact with certain irritants.

What is Atopic Dermatitis?

Atopic Dermatitis, is a continual inflammatory pores and skin circumstance characterised by way of patches of dry, itchy, and infected pores and skin. It regularly begins in infancy or early early life and may persist into maturity. Atopic Dermatitis is believed to result from a combination of genetic, immune device, and environmental factors. 

Causes of Atopic Dermatitis

  • Genetics: Atopic Dermatitis tends to run in households, suggesting a genetic predisposition. Certain versions in genes can affect the pores and skin's barrier characteristics, immune response, and inflammation, increasing the chance of growing the situation.
  • Immune System Dysfunction: Dysfunction in the immune system plays an important position in Atopic Dermatitis. Individuals with the condition often have an overactive immune reaction to triggers, mainly to irritation and pores and skin infection.
  • Skin Barrier Dysfunction: The pores and skin act as a barrier, defending the frame from irritants, allergens, and microbes. In Atopic Dermatitis, the skin barrier is compromised, permitting allergens and irritants to penetrate more easily and cause inflammation.
  • Environmental Factors: Environmental factors together with dry air, harsh soaps, detergents, and positive fabrics can exacerbate Atopic Dermatitis symptoms. Exposure to allergens like dust mites, pet dander, pollen, and mould also can trigger flare-ups.

Symptoms of Atopic Dermatitis

  • Itching: Itching is regularly the most prominent symptom of Atopic Dermatitis and can be excessive. Scratching can in addition irritate the skin, leading to greater inflammation and potential infection.
  • Redness: Affected areas of the skin may appear pink or infected, particularly at some point of flare-ups.
  • Dry, Scaly Skin: Atopic Dermatitis often reasons patches of dry, scaly pores and skin. These regions may also end up with hard, cracked, or maybe broadened fissures.
  • Thickened Skin: Prolonged scratching or rubbing can result in thickened, leathery skin, especially in areas which might be often affected.
  • Blisters or Papules: In a few instances, small fluid-filled blisters or raised bumps (papules) may additionally develop, especially through acute flare-ups.

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Similarities between Nummular Dermatitis and Atopic Dermatitis

  • Inflammatory Skin Conditions: Both Nummular Dermatitis and Atopic Dermatitis are inflammatory skin conditions characterized by patches of inflamed pores and skin.
  • Itching: Itching is a commonplace symptom of both Nummular Dermatitis and Atopic Dermatitis. It may be severe and distressing in both conditions.
  • Dry Skin: Both situations frequently result in dry skin. The pores and skin might also appear rough, scaly, or cracked.
  • Triggers: Both Nummular Dermatitis and Atopic Dermatitis may be caused or worsened via comparable factors, such as exposure to irritants, allergens, stress, or modifications in weather.

In summary, even though both Nummular Dermatitis and Atopic Dermatitis are varieties of eczema and proportion some similarities, they differ in their appearance, distribution on the frame, capacity triggers, and treatment processes.

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What is Nummular Dermatitis?

Nummular Dermatitis, also known as discoid eczema, is a type of eczema characterised using coin-fashioned or oval patches of infected, itchy pores and skin.

What is Atopic Dermatitis?

Atopic Dermatitis is a continual inflammatory pores and skin situation characterised by dry, itchy, inflamed pores and skin.

What reasons Nummular Dermatitis?

The actual reason for Nummular Dermatitis isn't always absolutely understood, however, it's miles believed to be triggered using elements consisting of dry pores and skin, irritants, allergens, cold weather, and pressure.

What causes Atopic Dermatitis?

Atopic Dermatitis is assumed to arise from a combination of genetic, immune gadgets, and environmental elements. It regularly runs in families with a record of allergic diseases.

What are the signs and symptoms of Nummular Dermatitis?

Symptoms of Nummular Dermatitis encompass coin-shaped or oval patches of infected, itchy skin, which may be purple, scaly, or crusty.

What are the symptoms of Atopic Dermatitis?

Symptoms of Atopic Dermatitis include dry, itchy, infected pores and skin, which can also seem crimson, hard, scaly, or cracked. It also can cause oozing, crusting, and thickened pores and skin.