Dermatology Made Easy is based on the most popular topics from DermNet NZ's vast array of material. The book combines the essential focus of the ‘Made Easy’ book series with the authority and knowledge base of DermNet NZ's unparalleled resources.
Author: Brian Wu, MD candidate, Keck School of Medicine, Los Angeles, USA. DermNet New Zealand Editor in Chief: Hon A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand. Copy editor: Maria McGivern. June 2017.
Nummular dermatitis is a common inflammatory disorder of the skin. It is also known as nummular eczema, discoid eczema or discoid dermatitis due to its distinctive, disc-shaped lesions. It can also be referred to as exudative neurodermatitis or nummular eczematous dermatitis.
The drug-induced form of nummular dermatitis is diagnosed when its onset is associated with certain medications.
Drug-induced nummular dermatitis has similar risk factors to the non-drug-induced form of nummular dermatitis; these include:
Nummular dermatitis can be caused by drugs that affect the function of the epidermal barrier or immune response. Drugs that can lead to excessive skin dryness and dermatitis include:
Nummular dermatitis presents with bilateral, well-defined circular, oval or disc-shaped erythematous plaques. They can be dry or exudative (oozy).
The diagnosis of drug-induced nummular dermatitis is based on taking a careful patient history and a physical examination. Additional investigations may include:
Treatments for nummular dermatitis aim to rehydrate the skin and repair the epidermal barrier. Treatment can include:
Nummular dermatitis may take months or sometimes years to resolve. When drug-induced, it may clear up more quickly on the cessation of the medicine that caused the dermatitis to appear.
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