Narrowband UVB Phototherapy

Narrowband UVB phototherapy uses a selected wavelength of ultraviolet light to treat certain skin conditions.

It is delivered in a standing cabinet, a hand-and-foot unit, or a targeted device, depending on where the skin is affected. Controlled exposure can calm inflammation in some conditions and may support repigmentation in vitiligo. It differs from tanning beds, which are not a substitute for prescribed phototherapy.

The light exposure itself should not be painful. You stand or sit in position while the equipment delivers light for the prescribed interval. Protective eyewear is worn, and genital protection may be advised for cabinet treatment.

Some people notice warmth, dryness or mild itch afterwards. Burning is not an intended effect. Tell the phototherapy team if you feel stinging during a session or develop tender, red skin afterwards so the schedule can be reviewed.

When prescribed and monitored, narrowband UVB has an established role in dermatology. The team sets the starting exposure based on your skin, diagnosis, previous reactions and medicines, then adjusts it according to how your skin responds.

Short-term effects can include redness similar to sunburn, itch, dryness, rash or activation of cold sores in people prone to them. Tell the team about light-sensitive conditions, new medicines, pregnancy, a history of skin cancer or a recent severe sun reaction before treatment begins.

Improvement develops gradually over a course of sessions, rather than after one exposure. How long benefit continues depends on the condition, its activity, home skin care and whether another treatment is used alongside phototherapy.

Some people need a maintenance plan, while others pause treatment and return if symptoms recur. The clinician will judge progress from the actual changes in your skin, such as reduced scale, itch or spread of patches, rather than relying on a fixed timetable.

Phototherapy appointments are brief, but the treatment plan requires regular attendance. Apply moisturiser after treatment if advised, and do not add new products or take extra sun exposure as a way to speed the response. The team needs to know about any change in medication.

A dermatologist may consider NB-UVB for psoriasis, atopic dermatitis, prurigo nodularis, vitiligo, some forms of eczema and other selected inflammatory disorders. Itchy skin and scaling can occur with several conditions, so an assessment identifies the problem being treated rather than treating the symptom as a diagnosis.

Phototherapy may be unsuitable or need modification if you are unusually sensitive to light, take a photosensitising medicine, cannot safely stand in the unit, or have skin findings that require a different assessment first.

Before the first session, the clinician records the diagnosis, examines the skin and reviews medicines and prior light reactions. The treatment area is exposed as instructed; unaffected areas may be covered. Remove cosmetics, fragrances or topical products only when the team has advised this.

At each visit, staff ask about redness or other reactions before setting the next exposure. Use the same clinic’s directions about daylight, moisturisers and prescribed creams, since unplanned changes can alter how your skin reacts.

There is usually no wound or dressing after NB-UVB. Moisturise dry skin, avoid deliberate tanning, and follow the plan for sun protection. If redness develops, protect the area and contact the clinic for advice before the next appointment rather than assuming the reaction will settle in time.

Repeated ultraviolet exposure is managed carefully because it can contribute to photoageing and may carry longer-term skin risks. Treatment records help the dermatologist balance benefit with exposure. Seek prompt advice for marked burning, blistering, eye symptoms after exposure, or a widespread reaction.

Alternatives depend on the diagnosis and severity. They can include moisturisers, topical anti-inflammatory medicines, topical vitamin D-related treatments, systemic medicines or targeted biologic treatment. A different option may be preferred when attendance is difficult or light treatment is contraindicated.

Look for a dermatology-led service that reviews your diagnosis, medication list and treatment response at regular intervals. Bring details of previous sun reactions and all skin products you use, including over-the-counter preparations.