Nummular Dermatitis

Nummular dermatitis is a name given to a stubborn, sometimes itchy rash that forms coin-shaped patches on the skin. The lesions as they get older may clear in the center resembling ring worm or fungus. The condition tends to be chronic, with periods of quiescence and exacerbation.The cause is unknown although it is more common in the winter. Nummular dermatitis is frequently associated with dry skin. Wool, soaps and frequent bathing (more than once a day) often worsen the condition. People with dermatitis have skin that is dry and easily irritated by soap, detergents, and rough wool clothing. Clothes washed or dried with liquid or sheet fabric softeners such as Cling, may also irritate the skin. Hot and cold weather often aggravates dermatitis. Certain allergies may worsen dermatitis, but they don't cause it.