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Ultraviolet light therapy is an effective method for the treatment of psoriasis, vitiligo and other skin diseases. However, due to the large individual differences in the human body, even the same individual may change the sensitivity to ultraviolet light at different treatment stages. Therefore, it is necessary to The initial irradiation dose was determined for each patient's photoreactivity and the treatment response after the last irradiation was checked each time a new irradiation dose was determined.

The initial irradiation dose of UVB therapy is determined by the competent physician before treatment based on the type of skin of the patient, or based on the measured minimum amount of erythema of the patient's UVB, and the minimum amount of phototoxicity. The initial dose of UVB therapy is usually 50-75% minimum erythema, 3-5 times a week. Whether each continuous treatment increases the dose of radiation and the rate of dose increase is determined by the frequency of treatment and the response to the treatment. In principle, the increased dose should be such that the erythema just visible after each exposure.

When combined with other therapies such as retinoic acid, calcipotriol, etc., care should be taken to adjust the dose and number of exposures. The light sensitivity of the skin of the calves, feet, palms and elbows is generally lower than that of other parts of the body, and the dose can be appropriately increased when irradiated. Treatment generally continues until the condition is completely relieved or the condition does not improve further after continuous treatment.

The treatment area should avoid excessive sun exposure after treatment. If a patient develops a phototoxic reaction or photoallergic reaction during treatment, it should be noted whether there has been excessive exposure to sunlight, whether to stop using the light stabilizer, or whether other photosensitizing drugs have been taken. In addition, some cosmetics, cleaning products, spices, vegetables, and intestines may contain photosensitizing substances.

Short-term adverse reactions after phototherapy are generally the same as those of excessive sun exposure, including erythema, edema, and occasional blisters. Once this occurs, some medications can be used in addition to adjusting the dose or pausing the treatment.