Nummular dermatitis

[Ernesto]

Nummular dermatitis is a persistent, usually itchy rash and inflammation characterized by coin-shaped spots, often with tiny blisters, scabs, and scales.

(See also Overview of Dermatitis.)

The cause of nummular dermatitis is unknown. Nummular dermatitis usually affects middle-aged and older people and occurs along with dry skin, especially in winter. Dermatophytid (id) reactions may manifest as nummular dermatitis. However, the rash may come and go without any apparent reason.