Clinical indications: vitiligo, psoriasis, pityriasis rosea, baldness, various eczema, various dermatitis Technical advantages: targeting: precise action on the target, the most normal skin without damage; high energy: high-purity single-frequency excimer light is 10 times more than ordinary ultraviolet light; efficacy: the lesion receives a higher dose in the shortest possible time, thus shortening the single treatment time .