Does narrowband UVB phototherapy treat dyshidrotic eczema?

Dyshidrotic eczema, also called pompholyx, can produce intensely itchy small blisters on the palms, fingers, or soles. Once blisters settle, cracking, peeling, and tenderness may remain. Narrowband UVB can reduce inflammatory activity in selected cases, but palms and soles have thicker skin and may respond differently from other areas. A clinician may first consider irritant exposure, contact allergy, fungal infection, medicines, or another blistering condition before choosing treatment. Phototherapy is part of a broader plan, not a way to drain blisters at home.

Keep the hands and feet moisturised with the product recommended for you, and avoid bursting blisters or peeling loose skin. Tell the clinician about wet work, gloves, metal exposure, allergies, and any medicines that increase light sensitivity. Follow instructions about washing, dressings, eye protection, and treated areas. Report increased burning, painful cracks, blistering, or difficulty walking or using your hands after a session.

Seek prompt assessment if blisters become cloudy, hot, increasingly painful, or surrounded by spreading redness, or if you develop fever. Urgent help is appropriate for swelling of the face or throat, breathing difficulty, or a rapidly spreading blistering eruption. Sudden widespread blisters or sores inside the mouth need medical review because they may not be dyshidrotic eczema.

Is this definitely dyshidrotic eczema, and should infection or contact allergy be checked? Can the planned light treatment reach my palms or soles? What should I use on cracks, and which reaction means I should contact the clinic?