Nummular dermatitis

Nummular dermatitis
Classification and external resources
Specialty	dermatology
ICD-10	L30.0
ICD-9-CM	692.9
DiseasesDB	33703
MedlinePlus	000870
eMedicine	derm/298

Nummular dermatitis (also known as "Discoid eczema,"^[1] "Microbial eczema,"^[1] "Nummular eczema,"^[2] and "Nummular neurodermatitis"^[2]^:82) is one of the many forms of dermatitis. Also known as discoid dermatitis, it is characterized by round or oval-shaped itchy lesions. (The name comes from the Latin word "nummus," which means "coin.")

Presentation

The disorder is recurrent and chronic, and may appear at any age, although it is most common in people in their 60s. Nummular dermatitis does not appear to be a genetic condition, is not related to food allergies, and is not contagious.

The coin-shaped patches can affect any part of the body, but the legs and buttocks are the most common areas. Flare-ups are associated with dry skin, so the winter season is a particularly bad time for those with this condition.

Other forms of dermatitis are at risk of developing, and patch testing may be helpful in diagnosis.^[3]

Other causes

Nummular eczema can also be worsened by stress and excessive caffeine, which dehydrates the body and thus the skin.

Treatment

One of the keys to treatment and prevention involves keeping the skin moisturized. Lotions, creams, and bath oils may help prevent an outbreak. If the condition flares up, a common treatment involves the application of topical corticosteroids. Oral antihistamines may help lessen itching. More severe cases sometimes respond to ultraviolet light treatment.

References

1 2 Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0.
1 2 James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
↑ Krupa Shankar DS, Shrestha S (2005). "Relevance of patch testing in patients with nummular dermatitis". Indian journal of dermatology, venereology and leprology. 71 (6): 406–8. doi:10.4103/0378-6323.18945. PMID 16394482.

External links

Discoid Eczema at Allergy UK
http://hardinmd.lib.uiowa.edu/dermnet/eczema6.html
http://library.med.utah.edu/kw/derm/pages/desy_23.htm
http://www.dermnet.com/Eczema-Nummular/ - Photo gallery on dermnet.com

Dermatitis and eczema (L20–L30, 690–693,698)

Atopic dermatitis	Besnier's prurigo

Seborrheic dermatitis	Pityriasis simplex capillitii Cradle cap

Contact dermatitis (allergic, irritant)	plants: Urushiol-induced contact dermatitis African blackwood dermatitis Tulip fingers other: Abietic acid dermatitis Diaper rash Airbag dermatitis Baboon syndrome Contact stomatitis Protein contact dermatitis

Eczema	Autoimmune estrogen dermatitis Autoimmune progesterone dermatitis Breast eczema Ear eczema Eyelid dermatitis Topical steroid addiction Hand eczema Chronic vesiculobullous hand eczema Hyperkeratotic hand dermatitis Autosensitization dermatitis/Id reaction Candidid Dermatophytid Molluscum dermatitis Circumostomy eczema Dyshidrosis Juvenile plantar dermatosis Nummular eczema Nutritional deficiency eczema Sulzberger–Garbe syndrome Xerotic eczema

Pruritus/Itch/ Prurigo	Lichen simplex chronicus/Prurigo nodularis by location: Pruritus ani Pruritus scroti Pruritus vulvae Scalp pruritus Drug-induced pruritus Hydroxyethyl starch-induced pruritus Senile pruritus Aquagenic pruritus Aquadynia Adult blaschkitis due to liver disease Biliary pruritus Cholestatic pruritus Prion pruritus Prurigo pigmentosa Prurigo simplex Puncta pruritica Uremic pruritus

Other	substances taken internally: Bromoderma Fixed drug reaction Nummular dermatitis Pityriasis alba Papuloerythroderma of Ofuji

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