Nummular eczema
Definition
Nummular eczema is an allergy-related disorder in which itchy, coin-shaped spots or patches appear on the skin.
Alternative Names
Eczema - nummular; Nummular dermatitis
Causes
The cause of nummular eczema is unknown, but there usually is a personal or family history of:
- Allergies
- Asthma
- Atopic dermatitis
It is relatively uncommon, and most often occurs in elderly men.
Several things may make the condition worse, including
- Dry skin
- Environmental irritants
- Stress
- Temperature changes
Symptoms
- Coin-shaped skin lesions
- On the arms and legs
- May spread to middle of body
- Ooze and become crusty
- Itching
- Scaly or raw skin
- Skin redness or inflammation
Exams and Tests
Your doctor can usually diagnose this condition by looking at your skin and asking you about your family's medical history.
A skin biopsy may be needed to rule out other similar conditions.
Treatment
Avoid triggers that can make your symptoms worse, such as wool, lanolin, and certain foods. Experts do not recommend taking frequent baths - excess bathing and soaps can cause dry skin, which often makes the condition worse.
Your doctor may recommend skin lotions, soaps, or moist bandages to soothe scaly, dry, or healing areas.
Persons with severe symptoms may be given prescription skin ointments that contain tar, corticosteroids, or immunosuppressive drugs. In rare, severe cases, the doctor may prescribe more powerful corticosteroids to be taken by mouth or injection.
Outlook (Prognosis)
Nummular eczema is a long-term (chronic) condition. Medical treatment and avoiding irritants can help reduce symptoms.
Possible Complications
A secondary infection of the skin may develop.
When to Contact a Medical Professional
Call your health care provider if you have symptoms of this condition.
Also call for an appointment with your health care provider if:
- Symptoms continue despite treatment
- You have signs of infection (such as fever, redness, or pain)
Prevention
There is no known way to prevent the disorder. Avoid any triggers that make your symptoms worse.
References
Morelli JG. Eczematous disorders. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier;2007:chap654.
Reviewed By: Michael Lehrer, MD, Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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