Red light therapy (RLT), near-infrared (NIR) therapy, blue light therapy, and yellow light therapy are widely regarded as safe, non-invasive treatments for improving skin health, promoting cellular repair, and reducing inflammation. However, as with any skin treatment, light therapy can occasionally lead to side effects - especially when misused or overused.

If you’re considering red light therapy or already using it, understanding potential skin reactions and how to avoid them is essential for safe and effective results.

Common Skin Reactions After Light Therapy

While the vast majority of users experience no negative effects, some may encounter temporary or mild skin issues. These include:

Dryness or Tightness

A feeling of dry or tight skin can occur post-treatment, especially if sessions are too long or frequent. This typically resolves within hours.

Why it happens: Overstimulation of the skin barrier or water loss due to extended exposure.

Mitigation:

• Limit exposure to 10–20 minutes per session.
• Moisturize after therapy using non-comedogenic, hydrating products (e.g., hyaluronic acid or aloe vera).
• Ensure ambient humidity is sufficient, especially in dry climates.

Mild Redness or Warmth

It’s normal to see slight redness immediately after a session, particularly on fair or sensitive skin types.

Why it happens: Vasodilation (widening of blood vessels) and increased circulation from light exposure.

Mitigation:

• Use the correct light intensity (irradiance). For skin use, a power density of 20–50 mW/cm² is generally recommended.
• Keep sessions within recommended time frames and distances (typically 6–12 inches from the skin).
• Allow skin to cool naturally afterward; avoid hot showers immediately after.

Photosensitivity

Although rare, individuals with certain medical conditions or on specific medications (e.g., tetracyclines, retinoids, or diuretics) may develop heightened sensitivity to light.

Mitigation:

• Review your medications with a healthcare provider before beginning light therapy.
• Conduct a patch test: expose a small area of skin for a short time and monitor for 24 hours.
• If prone to photosensitivity, opt for lower intensity or reduced treatment frequency.

Hyperpigmentation (Rare)

In very rare cases, users report increased pigmentation or dark spots, particularly if they have underlying melasma or sun damage.

Why it happens: Stimulation of melanocytes due to incorrect wavelengths or overuse.

Mitigation:

• Use wavelengths in the 620–660nm (red) and 810–850nm (NIR) range, which are shown to be safer and less likely to trigger melanin production.
• Avoid combining red light therapy with strong exfoliants, chemical peels, or retinols unless under professional guidance.
• Always wear SPF during the day, even if treatments are done at night.

Acne Breakouts

Some users experience purging or minor breakouts when beginning red light therapy.

Why it happens: Acceleration of skin turnover may temporarily bring underlying congestion to the surface.

Mitigation:

Avoid touching the face post-treatment.

Continue treatment consistently - breakouts often subside within 1 to 2 weeks.

Keep your device clean to avoid bacteria transfer. Wipe with alcohol or a gentle cleanser after each use.

How to Use Light Therapy Safely

To maximize benefits while avoiding unwanted skin reactions, follow these best practices:

✅ Follow a Consistent Protocol

Start with 2–3 sessions per week, 10–20 minutes each, at 6–12 inches away. Adjust based on skin response.

✅ Use a Clinically Supported Wavelength Range

Stick to red (620–660nm) and near-infrared (810–850nm) wavelengths for best results with minimal risk.

✅ Avoid Overuse

More is not better. Exceeding the biological window for red light therapy can reduce effectiveness or cause irritation. See our guide on the biphasic dose-response curve for more details.

✅ Choose a Certified Device

Ensure your red light therapy panel or mask is certified for safe, at-home use, and delivers consistent irradiance without flicker or UV radiation. All Kivo devices are certified and assessed for safety and effectiveness.

✅ Monitor Your Skin

Track how your skin responds over time. If irritation or discomfort develops, pause treatment and consult a dermatologist.

Aftercare Tips

After your light therapy session:

• Drink plenty of water to aid cellular repair.
• Apply a fragrance-free moisturizer to lock in hydration.
• Avoid harsh scrubs or active ingredients (like acids or retinoids) for a few hours.
• Stay out of direct sunlight for at least 6–12 hours.

Who Should Avoid Light Therapy?

Consult with a healthcare provider if you:

• Have autoimmune skin conditions like lupus
• Are pregnant or breastfeeding
• Have a history of skin cancer
• Are taking photosensitizing medications

Red light therapy is a safe and effective skin treatment when used properly. Most side effects are rare, mild, and temporary—and with the right precautions, you can enjoy the full benefits of light therapy without setbacks.

At Kivo Light Therapy, our devices are designed with optimized power density calibrated wavelengths, and medical-grade construction to help you treat skin issues safely at home.

Have questions about your skin and red light therapy?

Visit mykivo.com or reach out to our support team - we’re here to help.