Can Red Light Therapy Make Melasma Worse?

Melasma is a hyperpigmentation condition caused by excess melanin, often triggered by hormones, sun exposure, and inflammation. Many people wonder if red light therapy (RLT) is safe for melasma or if it could worsen pigmentation.

How Red Light Therapy Works

• Red light therapy uses red (620–700 nm) and near-infrared (700–1100 nm) wavelengths.

• It penetrates the skin to stimulate collagen, improve circulation, and promote healing.

• Importantly, RLT is non-UV and does not directly stimulate melanin production, unlike sun exposure or tanning beds.

Can It Make Melasma Worse?

• Generally, red light therapy is considered safe for melasma because it does not increase pigmentation.

• However, there are some caveats:

  1. Incorrect devices or wavelengths – very high energy or improper use could trigger heat or inflammation, which can sometimes worsen melasma.

  2. Combination with other light therapies – some devices combine red + near-infrared + blue light. Blue light can be safe, but UV-containing devices must be avoided.

  3. Sun exposure after therapy – RLT can increase circulation in treated skin, so unprotected sun exposure immediately afterward may trigger pigmentation flare-ups.

How to Use RLT Safely for Melasma

1. Stick to proper red/near-infrared wavelengths (620–680 nm red, 810–850 nm NIR).

2. Keep sessions moderate – typically 5–15 minutes per area, 2–4 times per week.

3. Always wear sunscreen after treatment when exposed to sunlight.

4. Avoid UV light devices or lamps marketed as “light therapy” that include UVA/UVB.

5. Patch test first – try on a small area of affected skin to see if any irritation occurs.

Key Takeaway

Red light therapy does not inherently worsen melasma and can be safe when used correctly. The main risk comes from heat, inflammation, or post-treatment sun exposure. Used properly, RLT may even help improve skin tone and texture without stimulating pigmentation.