Moisturizers and Phototherapy: What You Should Know
The Do’s and Don’ts of Using Lotion with UVB Light Therapy for Psoriasis
If you’re managing psoriasis with phototherapy, it’s natural to want relief from symptoms like dryness, itchiness, and scaling. Many patients reach for over-the-counter lotions—but not all moisturizers are phototherapy-friendly.
Using the wrong product, or applying it at the wrong time, could reduce the effectiveness of your treatment or even lead to unwanted side effects. Here’s what you need to know to safely combine moisturizers and phototherapy.
What Not to Do Before Your Phototherapy Session
❌ Avoid Lotions That Block UV Light
Some lotions contain UV-blocking ingredients—the same kind found in sunscreens. Applying these before a phototherapy session can create a barrier that reduces the effectiveness of UVB light, preventing it from reaching the skin and treating plaques.
❌ Watch Out for Photosensitizers
Natural and “clean” skincare products often include essential oils like lemon, lime, or orange. While they may sound soothing, these ingredients can act as photosensitizers, making your skin more sensitive to UV light. This may lead to unexpected redness, irritation, or even burns during your treatment.
What You Should Do for Better Results
✔️ Use Mineral Oil (If Recommended by Your Healthcare Provider)
If your provider approves, applying a thin layer of mineral oil directly to psoriasis plaques right before treatment can help. It works by reducing scaling and improving the penetration of UV light—maximizing your session’s effectiveness.
✔️ Moisturize After Your Treatment
Moisturizers are a great way to keep your skin hydrated—but timing matters. Apply lotions:
- After your phototherapy session, once your skin has cooled
- On non-treatment days to maintain hydration without interfering with light exposure
This approach gives you the benefit of relief without compromising your therapy results.
Final Tip: Talk to Your Provider
If you’re unsure about which skincare products are safe to use with your home or in-office phototherapy device, ask your dermatologist or treatment provider. They can help you choose moisturizers that support your skin health without affecting your treatment outcome.
Questions? We’re Here to Help.
Want to learn more about safe skincare during phototherapy treatment?
Contact the Phothera team to speak with a light therapy specialist.