How effective is narrowband UVB phototherapy for dyshidrotic eczema?

Dyshidrotic eczema causes intensely itchy, small fluid-filled blisters, often on the palms, sides of the fingers, or soles. Once blisters dry, cracking and soreness can continue. A dermatologist may consider hand- or foot-focused phototherapy when flares keep returning or topical treatment has not provided enough control.

Narrowband UVB uses controlled ultraviolet B exposure to quiet inflammation. Improvement is judged across repeated sessions, not by the appearance of one flare. The treatment may not suit every blistering rash, so your clinician may first check for contact allergy, infection, or another diagnosis. See [Dyshidrotic Eczema](/conditions/dyshidrotic-eczema/) and [Narrowband UVB Phototherapy](/treatments/medical-dermatology/narrowband-uvb-phototherapy/).

Keep a record of blistering, triggers, work exposures, and products used on your hands or feet. Apply moisturiser as instructed, protect cracked skin, and tell the clinic about medicines that increase light sensitivity or a history of unusual reactions to light. Avoid self-directed sun exposure and report burning before the next appointment.

Seek review if blisters become cloudy, crusted, increasingly painful, or surrounded by spreading redness, because infection can develop through cracked skin. Contact the phototherapy clinic for blistering or persistent burning after treatment. Urgent help is needed for facial swelling or breathing difficulty.

Ask: Is this definitely dyshidrotic eczema? Will the treatment cover my palms, soles, or both? How will we measure fewer flares? Which hand products should I stop? What reaction should be reported immediately?