Eczema - nummular; Nummular dermatitis
Nummular eczema is an allergy-related disorder in which itchy, coin-shaped spots or patches appear on the skin.
The cause of nummular eczema is unknown, but there usually is a personal or family history of:
It is relatively uncommon, and most often occurs in elderly men.
Several things may make the condition worse, including
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.