Nummular dermatitis is characterized by chronic or relapsing itchy coin-sized ovoid-shaped red plaques.

[8] Infection with Staphylococcus aureus bacteria or Candida albicans may also play a role.

If the condition flares up, a common treatment involves the application of topical corticosteroids.

If the condition occurs only during the sun-less winter months then vitamin D supplement might be an effective treatment.

[citation needed] The prevalence of nummular dermatitis in the United States is approximately 2 per 1,000.