Introduction
The 308 nm Excimer UVB laser is a targeted form of phototherapy that treats only the affected skin — not the surrounding healthy skin. By concentrating therapeutic ultraviolet-B light precisely on plaques or patches, we can deliver effective doses in fewer sessions compared to whole-body cabinet phototherapy, while keeping downtime low and comfort high.
At Skinhorizon Clinic, excimer laser is part of a comprehensive dermatology toolkit that includes LED phototherapy, photodynamic therapy, and advanced technologies like CO₂ laser and Endolift. Your plan is created and supervised by a consultant dermatologist in a CQC-regulated setting, focused on efficacy, safety, and long-term control.
Need rapid relief for stubborn plaques or discreet vitiligo patches? Start with a consultant assessment and a clear excimer plan.
How the technology works (technical detail)
Excimer phototherapy emits monochromatic UVB light at 308 nm, a wavelength that modulates the immune activity driving inflammatory skin disease. In psoriasis, it slows overactive keratinocyte proliferation and dampens pro-inflammatory signalling in plaques. In vitiligo, targeted UVB stimulates melanocyte activity in hair follicles and borders of patches, supporting gradual repigmentation.
Because treatment is focused only on affected skin, clinicians can use higher per-session doses than with whole-body UVB cabinets, allowing fewer sessions for localised disease. Sophisticated handpieces and spot sizes help contour energy delivery around curves of the body or face.
- Wavelength: 308 nm UVB (monochromatic).
- Mechanism in psoriasis: immunomodulation, reduction of epidermal hyperproliferation.
- Mechanism in vitiligo: melanocyte stimulation and immune modulation to encourage repigmentation.
- Targeting: beam restricted to plaques/patches to avoid unnecessary exposure to healthy skin.
Treatment process step-by-step
- Consultation & mapping: a consultant dermatologist confirms diagnosis (e.g., psoriasis vs. eczema vs. tinea), reviews medications, and maps treatment spots. Baseline photos may be taken to track response.
- Test dose & protocol: a small “test” exposure may be given to calibrate your starting dose based on skin type and disease activity. Your dose then increases gradually across sessions as tolerated.
- Session delivery: the handpiece is placed over each plaque/patch for a few seconds as per protocol. Each session typically lasts 10–25 minutes depending on number and size of areas.
- Adjunctive care: moisturisers and, when appropriate, a carefully chosen topical (e.g., vitamin D analogue or steroid-sparing agent) can improve comfort and speed results.
- Course length: localised psoriasis or vitiligo commonly needs 1–3 sessions per week over several weeks; many patients see visible change within the first 3–6 sessions.
We’ll provide a written plan with session frequency, dose progression, and aftercare so you know exactly what to expect.
Applications of 308 nm Excimer UVB in Dermatology
Excimer laser is particularly effective for localised disease where targeted, higher-dose UVB improves outcomes and convenience. We use it for:
- Psoriasis (localised plaques): scalp edge, elbows, knees, shins, ankles, and stubborn focal plaques elsewhere.
- Vitiligo (stable or slowly progressive): facial and segmental patches, small focal areas on trunk/limbs, hands with careful protocols.
- Atopic dermatitis (eczema): focal lichenified or recalcitrant areas, especially where topicals underperform.
- Other immune-mediated conditions (selected cases): e.g., alopecia areata patches, granuloma annulare, or prurigo nodularis — considered on a case-by-case basis.
For more extensive disease, we may recommend narrowband UVB phototherapy in a cabinet. LED and PDT can be integrated for specific goals (e.g., post-treatment healing, field treatment of sun damage).
Recovery & downtime
Most patients experience little to no downtime. Mild, short-lived redness and warmth in treated spots is common. Occasionally, temporary tanning or light dryness can occur. For scalp plaques, a gentle, fragrance-aware shampoo helps comfort.
- Activity: normal activities resume immediately.
- Skincare: moisturise treated areas; avoid harsh exfoliants, retinoids, or acids on those spots unless advised.
- Sun care: daily SPF on exposed skin; avoid deliberate sunbathing on treated sites during the course.
Safety & side effects
Excimer UVB is a well-established therapy in dermatology. Typical, temporary effects include redness, warmth, dryness, and very rarely blistering if the dose is too high. We adjust dosing based on your skin type (Fitzpatrick I–VI), recent sun exposure, and response, to minimise risks such as post-inflammatory pigmentation change.
We do not use excimer over suspicious lesions, active infection, or on photosensitised skin (certain medications or recent sunbeds). Eye protection is mandatory for facial work. In vitiligo, gradual repigmentation is expected; rarely, temporary dark edging (“rim” pigmentation) can occur and is managed within the plan.
Before & After Results: What to Expect
Many patients notice early improvements in itch and scale within the first few sessions for psoriasis plaques. Over subsequent weeks, plaques flatten and fade with smoother texture. For vitiligo, the earliest sign is often perifollicular repigmentation — tiny pigment dots around hair follicles that gradually expand and coalesce. Results build progressively across the course and continue to consolidate afterwards.
- Psoriasis: less redness and scaling in 2–4 weeks; plaques flatter and smaller over 4–8+ weeks depending on severity and site.
- Vitiligo: first pigment “islands” in 3–6 weeks (variable), with merging over months; facial areas often respond faster than hands/feet.
- Eczema flares: calmer, less itchy plaques in 1–3 weeks when used alongside a moisturiser-first plan and appropriate topicals.
Individual responses vary. Where disease is active or extensive, we may combine excimer with other therapies to optimise results.
Book Your Excimer UVB Laser Consultation
Ready to target stubborn plaques or support vitiligo repigmentation with precision? Get a consultant-led excimer plan tailored to your skin and schedule.
Why Choose Skinhorizon Clinic?
- Consultant-led protocols: dosing and schedules tailored to your diagnosis, skin type, and lifestyle.
- Targeted efficiency: treat only the affected areas with higher doses and fewer sessions compared with whole-body cabinet UVB for localised disease.
- Inclusive care for all skin tones: protocols adapted thoughtfully for Fitzpatrick I–VI to reduce PIH risk.
- CQC-regulated environment: eye protection, infection control, and evidence-based aftercare.
- Integrated options: combine with LED phototherapy, topical regimens, and (where appropriate) systemic therapies for durable control.
Frequently Asked Questions
How many sessions will I need?
Is treatment painful?
Is excimer safe for darker skin tones?
What areas can you treat?
Can excimer be combined with my creams or other therapies?
This page was reviewed by Dr Mohammad Ghazavi, Consultant Dermatologist, last updated August 2025.
Disclaimer: The information on this page is provided for general educational purposes about the 308 nm excimer UVB laser. It is not a substitute for medical advice. Suitability, dosing, and expected outcomes will be assessed during your consultation at Skinhorizon Clinic.
