UVB light treatment, also known as phototherapy, is a medical procedure that uses specific wavelengths of ultraviolet B light to treat various inflammatory and autoimmune skin conditions. In 2026, Narrowband UVB (NB-UVB), which uses a precise range of 311–312 nm, has largely replaced older broadband methods because it is more effective, requires shorter exposure times, and carries a lower risk of burning.
1. What is it? Common Names for This Procedure
UVB phototherapy involves exposing the skin to artificial ultraviolet light produced by specialized fluorescent lamps. It works by suppressing overactive DNA synthesis in skin cells, which effectively "dials down" inflammation and slows the rapid cell turnover seen in many chronic diseases.
- Common Names: Phototherapy, light therapy, NB-UVB treatment, or "light box" therapy.
- Main Types: * Narrowband UVB (Standard): Uses a very specific, therapeutic wavelength (311 nm).
- Broadband UVB (Older): Uses a wider range of the UVB spectrum (290–320 nm).
2. Common Symptoms for Medical Consultation
Patients are typically referred for UVB treatment when topical creams (like steroids) fail to manage these symptoms:
- Persistent Scaling and Plaques: Thick, silvery scales common in psoriasis.
- Chronic Itching (Pruritus): Severe, unremitting itchiness that interferes with sleep or daily life.
- Skin Redness and Inflammation: Widespread patches that remain angry and inflamed.
- Depigmentation: Loss of skin color (white patches), particularly in vitiligo.
3. List of Associated Diseases
UVB phototherapy is a frontline treatment for several chronic conditions:
- Psoriasis: One of the most common uses; it slows the rapid skin cell growth.
- Atopic Dermatitis (Eczema): Particularly for moderate-to-severe cases that don't respond to topicals.
- Vitiligo: Stimulates melanocytes to restore pigment.
- Cutaneous T-cell Lymphoma (CTCL): Used to treat early-stage Mycosis Fungoides.
- Lichen Planus: Helps resolve itchy, purple-toned skin bumps.
- Generalised Pruritus: Itchiness related to kidney or liver disease.
4. List of Screening Tests for This Procedure
Before treatment begins, a "safety map" of your skin is created:
- Fitzpatrick Skin Typing: Assessing how your skin naturally reacts to the sun (Types I–VI).
- Minimal Erythema Dose (MED) Test: A small test dose of UVB is applied to several squares on your back or arm to determine your "burn threshold".
- Medication Review: Screening for "photosensitizers"—drugs like certain antibiotics, diuretics, or herbal supplements (St. John's Wort) that make you burn faster.
- Clinical Eye Exam: Occasionally recommended to check for pre-existing cataracts, as UV light can affect eye health.
5. Am I Eligible for This Procedure?
- Eligible Candidates: Children, pregnant women (it is non-systemic), and those with stable chronic skin diseases.
- Absolute Contraindications (Ineligible): * History of Melanoma: Or other high-risk skin cancers.
- Lupus (SLE) or Dermatomyositis: Conditions that can be severely flared by UV light.
- Genetic Disorders: Such as Xeroderma Pigmentosum, which makes the skin unable to repair UV damage.
- Relative Contraindications: Patients with very fair skin (Type I) or those taking medications that cause extreme light sensitivity.
6. Pre and Post Care for This Procedure
Pre-Care:
- Avoid Blockers: Do not apply thick ointments (like yellow soft paraffin), sunscreens, or perfumes/deodorants 2–3 hours before treatment, as these can block the light or cause patchy burns.
- Eye & Genital Protection: You must wear provided goggles and, for males, cover the genitalia with a dark, close-weave cloth.
- Hair Consistency: Avoid drastic haircuts during the course, as "new" skin under the hair can burn easily.
Post-Care:
- Moisturize Regularly: UVB can dry out the skin; applying a bland moisturizer immediately after treatment helps soothe the area.
- Sun Protection: Your skin is more sensitive after medical UV exposure. Wear a high-factor sunscreen and protective clothing when outdoors.
- Monitor Reactions: Report any "painless pinkness" that lasts more than 24 hours to your nursing staff.
7. Days Required for Hospitalization
UVB phototherapy is a routine outpatient procedure.
- Procedure Time: Actual light exposure starts at seconds and gradually increases to a few minutes.
- Frequency: Usually 2 to 3 times per week for 7–12 weeks.
- Hospital Stay: 0 days. You can drive yourself home and go back to work immediately.
Disclaimer: As per doctor’s advice, the frequency and total number of treatments (often 24 to 36 sessions) may be modified based on your skin condition and how quickly your lesions clear.
8. Benefits of This Procedure
- Non-Systemic: Unlike pills or biologics, UVB doesn't suppress your entire immune system, making it safer for children and pregnant patients.
- High Clearance Rates: Over 70–80% of psoriasis patients see significant clearance or remission after a standard course.
- Cost-Effective: It is generally much more affordable than long-term biologic therapies.
- Drug-Free Relief: Provides a sustainable option for those who cannot tolerate or prefer to avoid daily medications.
- Long Remissions: Many patients enjoy months of clear skin even after the light treatments are stopped.
