Narrowband UVB Phototherapy & Xtrac Laser in Hercules & petaluma

For patients with certain chronic or itchy skin conditions, narrowband UVB (NB-UVB) phototherapy is one of the most effective dermatologic therapies available today. It combines proven efficacy and safety to settle down the skin’s inflammation.

At Dermatology Associates of the Bay Area, our board-certified dermatologists and PAs use narrowband UVB to help patients achieve clearer, healthier skin in a controlled, medical setting.

What is Narrowband UVB Phototherapy?

Narrowband UVB Phototherapy refers to the use of specific wavelengths of ultraviolet (UV) light to treat skin conditions. It uses a specific portion of the ultraviolet spectrum—specifically, wavelengths between 311 and 313 nanometers. Research has shown that this narrow range of UVB light is particularly effective in calming inflammation and slowing down the rapid skin cell turnover that underlies many dermatologic diseases.

Unlike older forms of broad-spectrum phototherapy, narrowband UVB minimizes exposure to unnecessary UVB or UVA. Patients receive light treatment in a specialized phototherapy full-body unit, which resembles an old school phone booth. We also have specific nUVB hand-foot units for conditions in these specific areas.

How Does NB UVB Work?

The therapeutic benefits of narrowband UVB occur at the cellular level. When UVB light penetrates the skin, it affects immune cells and signaling pathways that drive inflammation. This leads to:

Reduced skin cell turnover: In conditions such as psoriasis, the skin reproduces cells too quickly, leading to thick, scaly plaques. UVB slows this process.
Decreased inflammation: Narrowband UVB suppresses inflammatory mediators, helping reduce redness, itching, and discomfort.
Immune system regulation: Many skin diseases are linked to overactive or misdirected immune responses. NB-UVB helps normalize immune activity within the skin.

Due to these combined effects, phototherapy addresses both symptoms and the underlying mechanisms of the disease.

Conditions Treated with Narrowband UVB

NB-UVB phototherapy is an FDA-approved, noninvasive light treatment used to manage a variety of chronic skin conditions safely and effectively.

Psoriasis: Helps slow abnormal skin cell growth, reduce redness and scaling, and improve overall skin clarity.
Vitiligo: Stimulates melanocytes to restore pigment, especially effective on the face and trunk.
Atopic Dermatitis (Eczema): Calms inflammation, relieves itching, and supports healthier skin barrier function.
Cutaneous T-Cell Lymphoma (CTCL): Reduces malignant T-cells in early stages of mycosis fungoides for symptom relief.
Lichen Planus: Minimizes inflammation and speeds healing of itchy, violaceous bumps.
Pruritus (Chronic Itching): Provides relief when topical or oral medications are ineffective.
Other Conditions: May also be used for polymorphous light eruption, prurigo nodularis, and chronic hand or foot dermatitis.

NB-UVB phototherapy offers a safe, proven option for patients seeking to reduce inflammation, restore skin balance, and improve comfort across multiple skin conditions.

What to Expect During Narrowband UVB and Xtrac Laser Treatment

At Dermatology Associates of the Bay Area, we provide comprehensive phototherapy treatments in a comfortable, professional setting. Our experienced team will guide you through each session to ensure safe, effective care tailored to your skin condition.

Treatment Schedule

Most patients receive treatments two to three times per week in our office. Each session typically lasts only a few minutes, although time may gradually increase as tolerated.

Procedure

Patients stand in a phototherapy booth equipped with UVB lamps or use a smaller targeted unit for localized conditions. Protective eyewear is always provided, and sensitive areas like the face or genitalia may be shielded.

Combination with Other Therapies

NB-UVB can be used alone or in combination with topical treatments, systemic medications, or biologic therapies to optimize results.

At Dermatology Associates of the Bay Area, our board-certified dermatologists and PAs are highly experienced in administering NB-UVB treatments. We offer state-of-the-art equipment, individualized dosing protocols, and comprehensive care to ensure the best possible outcomes.

If you or a loved one is struggling with a chronic skin condition, phototherapy may be the solution you’ve been searching for. Contact our offices in Petaluma or Hercules today to schedule a consultation and learn whether narrowband UVB can help restore your skin’s health and comfort.

XTRAC® Laser Treatment for Psoriasis and Vitiligo

At Dermatology Associates of the Bay Area, we are proud to offer the XTRAC® excimer laser, an advanced, FDA-cleared treatment for chronic skin conditions such as psoriasis and vitiligo. This targeted therapy uses a highly concentrated beam of ultraviolet B (UVB) light to gently deliver energy to affected areas, without exposing the surrounding healthy skin.

How It Works

Unlike traditional phototherapy, which treats the entire body, the XTRAC® laser pinpoints only the involved skin. Treatments are quick, painless, and require no downtime.

By stimulating natural immunologic processes in the skin, XTRAC® helps reduce redness, scaling, and itching associated with psoriasis, and encourages repigmentation in areas affected by vitiligo.

What to Expect

Most patients notice improvement within 6–10 sessions, though the exact number of treatments varies depending on the condition’s severity and location. Sessions typically last only a few minutes and can be scheduled conveniently during a lunch break or after work.

Because the XTRAC® laser is so precise, higher therapeutic doses can be delivered safely, often leading to faster clearance and longer-lasting remission compared with conventional therapies.

Why Choose XTRAC®

This non-invasive treatment is an excellent option for patients who have not achieved adequate results with creams or who prefer to avoid systemic medications. It is safe for both adults and children, and can be used on delicate areas such as the scalp, face, and folds of skin.

If you are seeking a proven, effective, and convenient solution for psoriasis or vitiligo, ask us whether XTRAC® laser therapy is right for you.

Dermatology Associates of the bay area doctors, pa, aesthetician, and staff. Group image outside.

Why Choose Dermatology Associates of the Bay Area?

Our team of board-certified dermatologists is dedicated to providing expert skin care for patients of all ages. At Dermatology Associates of the Bay Area, we combine advanced dermatology techniques with personalized care to help you achieve healthy, beautiful skin.

Choose a trusted dermatology practice committed to exceptional care and long-term skin health.

What sets us apart:

Board-Certified Dermatologists – Our dermatologists have completed rigorous training and certification to deliver the highest level of dermatologic care. Our medical colleagues recognize our expertise, and as such, we have been recipients of Castle Connolly Top Doctors – including most recently in January 2025
Comprehensive Skin Care – From medical dermatology and acne treatment to advanced acne scar solutions and cosmetic procedures, we offer a full range of services under one roof.
Patient-Focused Approach – Every treatment plan is customized to fit your unique skin type, concerns, and goals.
Advanced Technology – We use clinically proven treatments and devices for effective, safe results.

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Narrowband UVB Phototherapy & Xtrac Laser

Frequently Asked Questions

What is narrowband UVB phototherapy?

Narrowband UVB phototherapy uses specific wavelengths of ultraviolet light (between 311 and 313 nanometers) to treat chronic skin conditions. Unlike older forms of broad-spectrum phototherapy, narrowband UVB minimizes exposure to unnecessary UVB or UVA wavelengths, providing effective treatment with improved safety.

How long does each phototherapy session take?

Each narrowband UVB session typically lasts only a few minutes, although treatment time may gradually increase as your skin tolerates higher doses. Sessions are convenient and can easily fit into your schedule.

How often will I need phototherapy treatments?

Most patients receive narrowband UVB treatments two to three times per week at our office. The exact frequency and total number of sessions depend on your specific condition and how your skin responds to treatment.

What conditions can be treated with narrowband UVB phototherapy?

Narrowband UVB is FDA-approved to treat psoriasis, vitiligo, atopic dermatitis (eczema), cutaneous T-cell lymphoma, lichen planus, and chronic itching. It may also be used for polymorphous light eruption, prurigo nodularis, and chronic hand or foot dermatitis.

How is the XTRAC laser different from narrowband UVB phototherapy?

The XTRAC excimer laser delivers targeted UVB light only to affected areas, while traditional narrowband UVB treats larger areas or the entire body. XTRAC treatments are quick, painless, and allow higher therapeutic doses to be delivered safely to specific spots, often leading to faster clearance.

How many XTRAC laser sessions will I need?

Most patients notice improvement within six to 10 sessions, though the exact number varies depending on the severity and location of your condition. Each session lasts only a few minutes and requires no downtime.

Is phototherapy safe for children?

Yes, both narrowband UVB phototherapy and XTRAC laser treatment are safe for children and adults. Our board-certified dermatologists carefully customize treatment protocols based on age, skin type, and condition severity.

Can I combine phototherapy with other treatments?

Narrowband UVB can be used alone or in combination with topical treatments, systemic medications, or biologic therapies to optimize results. Your dermatologist will create a personalized treatment plan based on your specific needs and goals.