UV light for eczema: what to know

Phototherapy uses a controlled dose and selected wavelength to influence inflamed skin. It is different from sunbathing or using a home lamp without guidance. A dermatologist considers the eczema pattern, skin tone, medicines, previous light reactions, and whether infection or another diagnosis is present. Eczema commonly causes itch, dryness, scaling, cracking, and sometimes crusting. UV may be discussed when standard care has not provided enough control, but it is not suitable for every person or every flare. Treated skin can also develop temporary colour changes, including post-inflammatory hyperpigmentation.

Attend scheduled assessments and report redness, tenderness, itching that is new or stronger, blistering, or darkening promptly. Protect areas not prescribed for treatment and follow the clinic's instructions about medicines, moisturisers, and sun exposure. Do not increase exposure time yourself or combine phototherapy with tanning. Keep using the eczema plan provided by your clinician, including gentle cleansing and regular moisturising, unless they advise a change.

Contact the clinic promptly for a painful burn, blisters, rapidly worsening redness, marked swelling, or a new rash outside the treated areas. Seek urgent care for eye pain or vision changes, fever with spreading crusting or oozing, facial swelling, or breathing difficulty. A flare with severe itch, cracking, or sleep disruption may need treatment adjustment rather than extra UV.

Ask which phototherapy type is being considered, why it fits your eczema, how the dose will be adjusted, which medicines increase light sensitivity, and how colour changes or burns will be managed.