Understanding Phototherapy: Clearer Skin, Naturally

What Is Narrowband UVB Light Therapy?

Phototherapy, also called narrowband UVB or NB-UVB, is a type of light therapy that uses a very specific wavelength of light to gently reduce inflammation, redness, and itching. It helps slow down the overactive skin cell growth that causes flares in eczema and psoriasis.

Unlike the broad rays of sunlight, NB-UVB focuses only on the healing part of the light spectrum. You get the benefits without the burn. It’s safe for all skin types and has been used for decades as one of the most effective non-drug treatments for chronic skin conditions.

What to Expect During Treatment

Phototherapy sessions happen two to three times per week. During each visit, you stand in a specially designed light unit that looks like a vertical booth. Each session lasts only a few minutes. You wear protective goggles and any sensitive areas are covered.

NB-UVB therapy is painless. You may feel gentle warmth, and mild pinkness or dryness can occur as your skin adapts. Most people notice improvement after 6 to 8 weeks, with continued clearing over several months of steady treatment.

Safety Guidelines & Monitoring

Narrowband UVB is one of the safest forms of light therapy when used under medical supervision. It delivers a controlled wavelength of light that helps calm inflammation without damaging the skin. The risk of burning or long-term UV damage is very low.

Narrowband UVB is not the same as tanning bed light. Tanning beds use UVA light, which penetrates deeper into the skin and is linked to an increased risk of melanoma and other skin cancers. NB-UVB is designed specifically to treat eczema and psoriasis safely.

Your Zest care team helps you start at the right dose, monitors your progress closely, and adjusts as needed so your treatment stays safe and effective.

Results You Can Expect

Most people notice their skin feels calmer and less itchy after just a few weeks, with visible clearing by two to three months of regular treatment. Over time, many people extend the space between sessions or reduce other medications while maintaining control.

When paired with a personalized approach that addresses triggers like stress, sleep, and nutrition, NB-UVB becomes part of a long-term plan for clear, stable skin.

Transitioning from a Biologic to Phototherapy

Biologic medications provide excellent control for many people. But they are not always needed long term. Once your skin is clear and stable, you may choose to transition from a biologic to NB-UVB phototherapy to maintain results with less medication.

There are several reasons you might consider making this shift:

• Family planning. Phototherapy is a safe, non-drug option during pregnancy and breastfeeding.
• Frequent infections. If you catch colds more often or feel run down, phototherapy helps manage inflammation without affecting your immune system.
• Fewer medications. Light therapy supports your skin's healing naturally, making it a good option if you want to reduce your reliance on prescriptions.

Phototherapy helps maintain your skin's balance and control inflammation while giving your body a break from systemic medication. With the right guidance and monitoring, it is a safe and effective step-down strategy that supports long-term health.

How to Know If You’re Ready to Step Down

Everyone's skin journey is different. Here are a few signs that you may be ready to move from a biologic to phototherapy:

• Your skin has been clear and stable for several months with little to no flares.
• You have reached your treatment goals and want to maintain results using fewer medications.
• You are feeling well overall and want a more natural approach to skin maintenance.

Your care plan at Zest adapts with you. Your team helps you identify the right time to step down and introduces phototherapy safely and effectively.

The goal is not just to come off medication. It is to stay clear, feel confident, and support long-term skin health in a way that fits your life.

Insurance Coverage & Expense

Narrowband UVB phototherapy is often covered by insurance when prescribed for eczema or psoriasis. Coverage varies depending on your plan and whether treatments are done in a clinic or at home. Your Zest care team helps you understand what is included and what to expect before you begin.

For many people, at-home phototherapy is a one-time financial investment that is more affordable over time than ongoing in-office treatment or higher-cost biologic medications. The goal is effective, evidence-based care that fits your life and your budget.

Want to know if light therapy could be right for you? Send a message through your Zest portal. Your care team walks you through your options and helps you choose the plan that fits your skin, your goals, and your lifestyle.