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Nummular dermatitis in Adult
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Nummular dermatitis in Adult

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Contributors: Jeffrey M. Cohen MD, Catherine J. Wang, Susan Burgin MD
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Synopsis

Nummular dermatitis : Fine scaly plaque, Round configuration, Scattered few, Pruritus
Nummular dermatitis (nummular eczema) is a particular form of dermatitis characterized by pruritic, coin-shaped, scaly plaques. It is of uncertain etiology, but the onset is associated with triggers such as frequent bathing, low humidity, irritating and drying soaps, skin trauma, interferon therapy for hepatitis C, and exposure to irritating fabrics such as wool. Venous stasis may be a predisposing factor to developing lesions on the legs. Many authorities consider it to be a form of eczema, and some patients often have some of the signs and symptoms associated with classic atopic dermatitis. However, a majority of individuals with nummular dermatitis do not have a personal or family history of atopy. Infectious etiologies, particularly respiratory and dental infections, have been investigated but this association remains unclear. Ultimately, the etiology of nummular dermatitis remains incompletely elucidated.

Nummular dermatitis is pruritic but may be less pruritic than other common diagnoses with scaly plaques (eg, tinea). Autoeczematization (widespread eczematous eruption secondary to triggers such as infection or severe localized eczema) and impetiginization (superinfection of impaired skin barrier) may be seen. Nummular dermatitis is most common in men, and the peak age of incidence is between 50 and 65 years. The second most common age range of incidence is 15-25 years.

Codes

ICD10CM:
L30.0 – Nummular dermatitis

SNOMEDCT:
81418003 – Nummular dermatitis

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

Other dermatoses with a nummular configuration:

Best Tests

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Management Pearls

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Therapy

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Drug Reaction Data

Below is a list of drugs with literature evidence indicating an adverse association with this diagnosis. The list is continually updated through ongoing research and new medication approvals. Click on Citations to sort by number of citations or click on Medication to sort the medications alphabetically.

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References

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Last Reviewed:01/31/2017
Last Updated:03/28/2017
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Nummular dermatitis in Adult
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A medical illustration showing key findings of Nummular dermatitis : Fine scaly plaque, Round configuration, Scattered few, Pruritus
Clinical image of Nummular dermatitis - imageId=216877. Click to open in gallery. caption: 'Discrete, round, light red and brown plaques on the back.'
Discrete, round, light red and brown plaques on the back.

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