Blue-Red Light Therapy: A Complete Guide
Blue-red light therapy is a non-invasive, drug-free treatment that uses two specific wavelengths of light to target skin and health concerns. It is used in dermatology, spas, and at-home devices for acne, アンチエイジング, wound healing, および炎症.
How it works
1. Blue light (415–450nm) goes into the surface layers of the skin (1–2mm) and targets the oil glands and bacteria.
Key benefits:
It kills the bacteria that cause acne (P. acnes).
It can also reduce excess sebum (oil) production.
The FDA has approved it for mild to moderate acne.
2. 赤信号 (630–660nm)Penetrates deeper (5–10mm)Stimulates cellular repair & collagen.
Key benefits:
It boosts collagen and elastin (which help with anti-aging).
It also reduces inflammation and redness (rosacea, acne scars).
It also speeds up wound healing, whether from burns, cuts or other procedures.
Why combine them?
For acne: Blue kills bacteria, while red reduces redness and scarring.
Study: Combining the two treatments improved acne 77% compared to 50% with blue alone (Journal of Cosmetic and Laser Therapy).
For ageing skin:
Red smooths wrinkles and blue prevents spots.
For healing after treatment:
Blue prevents infection, while red speeds recovery (例えば, after peels/laser).
How it’s delivered1. Professional treatmentsDermatology clinics (FDA-approved devices like Omnilux, LightStim).
Medical spas (often combined with facials or peels).
2. At-home devicesMasks (例えば, CurrentBody, Dr. Dennis Gross SpectraLite).
Handheld wands (例えば, Foreo UFO 3).
パネル (例えば, Merican Red Light Therapy Panel M1).
Proven Uses
Condition Blue Light Red Light Combo
Acne ✅ 🟡 (Redness) ✅✅
Wrinkles ❌ ✅ ✅
Rosacea ❌ ✅ ✅
Wound Healing ❌ ✅ 🟡
Hair Growth ❌ ✅ ❌
How Long Until Results?
Acne: 4–8 weeks (3–5 sessions/week).
Anti-Aging: 8–12 weeks (consistent use).
Pain/Inflammation: 2–4 weeks (daily use).
Who should avoid it?
If you have porphyria or lupus, you may be more sensitive to blue light.
If you are taking photosensitising medication (e.g. Accutane, doxycycline).
Women who are pregnant should also avoid it, although there is limited research on this.
Here are some tips to get the best results:First, cleanse your skin (no makeup or sunscreen).
Use red light after blue light (this makes the skin heal more quickly).
Moisturise after (RLT boosts product absorption).
You can also combine it with other skincare products (例えば, vitamin C for anti-aging, niacinamide for acne).
The bottom line
Blue-red light therapy works for acne, ageing and healing, but only if you use it regularly and make sure that the device is good quality. For severe cases, combine with professional treatments (e.g. lasers or peels).
