RADNOR, Pa., May 18 -- PhotoMedex Inc. has submitted an application for 510 (k) clearance from the US Food and Drug Administration to commercially market its XTRAC laser system for the treatment of Atopic Dermatitis. Atopic Dermatitis, commonly known as eczema, is a chronic inflammation of the skin that can afflict persons of any age, but is considered to be the most common skin condition in children under the age of 11.