🧐What is UVB phototherapy?
Ultraviolet B (UVB) phototherapy delivers shortwave ultraviolet radiation to treat skin conditions such as psoriasis.      Phototherapy works by suppressing DNA synthesis, which in turn reduces inflammation.

👋What are the benefits of UVB phototherapy?
Can be used to treat the whole body or localised areas.
Narrowband UVB phototherapy is less likely to cause cancer than PUVA (photochemotherapy) as there is less UV exposure and a narrower range of UV radiation.
In some places, home phototherapy may be offered.
Safer and often cheaper alternative to systemic therapy.

✅Psoriasis
Psoriasis is a chronic inflammatory skin disorder, which varies considerably in extent and severity.    UVB is suitable for most people with extensive psoriasis.    It may not suit those with very fair skin or those whose psoriasis gets worse in sunlight.

Most patients will have clearance or improvement in their psoriasis after 12 to 24 treatments.    After treatment is discontinued the skin may remain clear for months.    If psoriasis flares up again, further UVB treatment may be necessary.

✅Dermatitis
UVB is occasionally used for severe cases of dermatitis, especially atopic dermatitis (eczema).    Frequency and dosage of treatment are usually longer than for psoriasis.

✅Vitiligo
UVB is effective in treating vitiligo by immune suppression and stimulation of cytokines.    Treatment is given twice a week for 3–4 months and continued until re-pigmentation is complete or for 1–2 years.    It may take several months to see an improvement.

Treatment recommendations (for reference only):
1.    Individualized treatment plans.
2.  Initial dosage should be determined based on skin type or minimum erythema,
typically ranging from 50% to 75% of the minimum erythema.    For patients who
have not undergone the minimum erythema dose test, it is recommended to start
with a dosage of 0.1 J/cm2.
3.    The frequency of irradiation should be determined based on the condition of
the patient and is recommended to be every other day.
4.    In general, treatment can be terminated afer the regression of skin lesions.
5.    In rare cases, afer the regression of skin lesions, maintenance treatment may
be required once or twice a week to maintain skin condition.
6.    Treatment can be resumed if necessary

Notice：
1. Do not apply any ointments or cosmetics (including perfumes and coal tar) except as directed by your doctor or phototherapist.
2.Follow your phototherapist’s advice re. application of moisturisers or sunscreens. Some products may prevent absorption of UVB if applied before treatment. In general, they should be avoided for 2 hours before the phototherapy exposure, but should be applied after the treatment.
3.Avoid other sources of exposure to ultraviolet light including natural sunlight and tanning beds.
4.During treatments, eye or full face UV protection with goggles or a face mask should be used, and genitalia covered
5.Ensure you are attending regular appointments with your dermatologist.