**4. Targeted phototherapy**

Also called focused phototherapy, it involves the emission of ultraviolet radiation directly at skin lesions through special delivery mechanisms. Targeted phototherapy includes laser and nonlaser technologies.

Excimer lamp is a targeted phototherapy that delivers a specific wavelength of 308 nm of UVB radiation to localized areas of skin lesions. Compared to NB-UVB, targeted phototherapy is more effective and safe. Unlike other laser devices, its templates are compatible with the contours of the target area, which means that they do not expose the normal skin to radiation. The effects of the laser can be delivered with a low cumulative dose and a shorter treatment duration, which are ideal for patients looking for a quick and effective solution. The spot size of the excimer lamp is wider than that of the excimer laser, which helps speed up the treatment of large areas of hair loss within a short time [31, 32].

#### **4.1 Advantages of targeted phototherapy**


#### **4.2 Disadvantages of targeted phototherapy**


#### **4.3 Indications of targeted phototherapy**

Localized psoriasis Localized vitiligo Mycosis fungoides Atopic dermatitis Alopecia areata Localized morphea Urticaria pigmentosa
