dermatologic disorders
Nummular Dermatitis
Key Points
Nummular dermatitis is often a manifestation of atopic dermatitis; in nonatopic patients, the etiology of nummular dermatitis is unknown. Patients present with single or multiple pruritic coin-shaped, well-demarcated, erythematous scaly patches or plaques. Diagnosis is clinical; skin infections and psoriasis must be excluded. Treatment includes topical corticosteroids and phototherapy; systemic immunosuppressants are rarely needed. 