Can Red Light Therapy Cause Face Dark Spots or Sun Spots to Get Darker?

Short Answer:
Red Light Therapy (RLT) is generally safe and is unlikely to cause or darken face dark spots (hyperpigmentation) or sun spots (solar lentigines). Unlike UV light, which triggers melanin production, RLT operates in the red and near‑infrared spectrum (630–700 nm), making it safe for most skin types. However, in rare instances — especially in people with highly photosensitive skin or certain conditions like melasma — changes in pigmentation might occur.

How Red Light Therapy Works

RLT uses non‑UV wavelengths to penetrate the skin, stimulate mitochondrial activity, and support collagen production and cellular repair.
✅ Red Light = Supports cellular repair
✅ Near‑Infrared Light = Reduces inflammation and promotes healing
Importantly, Red Light Therapy does NOT produce UV radiation — the primary cause of darkening hyperpigmented spots.

Red Light Therapy and Pigmentation

General Safety

Research from reputable sources such as Cleveland Clinic and Healthline confirms that Red Light Therapy is safe for most skin types and does not cause burns or UV‑induced damage. It is NOT associated with darkening spots.

Potential Benefits for Hyperpigmentation

Studies mentioned in Verywell Health indicate Red Light Therapy can aid in reducing hyperpigmentation by:

• Helping to even out skin tone

• Reducing post‑inflammatory hyperpigmentation

• Improving overall skin health

Rare Cases Where Darkening Might Occur

Although Red Light Therapy doesn’t cause hyperpigmentation, certain factors can cause skin discoloration:

1. Underlying Skin Conditions:

   • Melasma, lupus, or other conditions can make skin more reactive.

2. Photosensitive Medications:

   • Certain medications (e.g., retinoids, antibiotics) can increase sensitivity.

3. Improper Use:

   • Excessive treatment or low‑quality devices may irritate the skin, potentially leading to temporary redness that mimics dark spots.

4. External Factors:

   • Sun exposure, hormonal changes, or skin trauma from treatments can cause or worsen dark spots.

Evidence Gaps

Although Red Light Therapy has been extensively studied for its benefits, long‑term data focusing exclusively on its effects on pigmentation are limited. The consensus among dermatologists is that Red Light Therapy is safe and does not cause hyperpigmentation or sun spots for the average user.

Best Practices for Safe Red Light Therapy

✅ Use a High‑Quality Device: Ensure your device operates within the red or near‑infrared spectrum (no UV).
✅ Protect Your Skin: Apply a broad‑spectrum SPF 30+ daily.
✅ Perform a Patch Test: Try Red Light Therapy on a small area first to assess your skin’s reaction.
✅ Consult a Doctor: If you have melasma, very dark skin, or a medical condition that causes photosensitivity, ask a doctor before starting Red Light Therapy.

Final Thoughts

Red Light Therapy is generally safe for hyperpigmentation and does not cause or worsen dark spots when used properly. In fact, it may even aid in improving hyperpigmentation caused by acne scars or sun damage. If you notice any unexpected changes in your skin, consult a dermatologist to rule out other causes.