ADVANTAGES​
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• Healthy skin surrounding the affected areas is not exposed to radiation

• Different templates are used according to the area to be treated

• A higher dose of radiation can be delivered, with a reduced cumulative dose of irradiation

• In some cases, a shorter course of treatment is effective

• It can be used in areas difficult to reach with conventional phototherapy, such as ears and genitals

• It can be used in children, as it is a relatively friendly–looking piece of equipment.

 
SIDE EFFECTS​
 
In most cases, excimer light is tolerated well. The aim of treatment is to deliver a dose that induces visible redness in the psoriatic lesion (supra-erythematous dose), but that does not induce a blister or second-degree burn. It causes blisters on treated areas if the dose is too high. 
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Other side effects include:

• Painful erythema

• Hyperpigmentation

• Erosions 

• Koebnerisation (development of skin lesions due to trauma in case of a burn)

• Reactivation of herpes virus infection.​