Excimer is a method of treating skin diseases by amplifying UVB energy of 308 nm and irradiating directly to the affected area to stimulate melanin pigments to induce re-forming of the pigments. 

The Excimer 308 nm light system is a very effective device in the treatment of various skin diseases including: (atopy, eczema, psoriasis, vitiligo, and alopecia areata), and can be used at a wide range of places at a lower cost. It is a device that can be used in small dermatology, internal medical clinics, and pediatric hospitals, where it was difficult to introduce expensive equipment at the same performance and economical price