Legitimate Uses of Red Light Therapy in Dermatology

Established Medical Applications

The British Journal of Dermatology recommends red light therapy as a treatment option for actinic keratosis, particularly for cosmetically sensitive sites, multiple lesions, and large-area lesions, with complete clearance rates reaching 73.5% with appropriate application times 1, 2
The British Journal of Dermatology suggests photodynamic therapy (PDT) as a treatment option for squamous cell carcinoma in situ (Bowen disease), especially for poorly healing or cosmetically sensitive sites, multiple lesions, and large-area lesions, with initial clearance rates of 82-88% 1, 3
Red light provides enhanced penetration compared to shorter wavelengths for superficial basal cell carcinoma treatment, but PDT should not be offered as standard treatment for nodular BCC at high-risk sites 4, 1
The British Journal of Dermatology recommends considering PDT for cutaneous T-cell lymphoma, particularly for early-stage disease, few localized lesions, and challenging sites such as skinfolds 1
PDT can be considered for vulval intraepithelial neoplasia, unifocal, nonpigmented lesions without HPV infection and with lower grades of dysplasia 5
The British Journal of Dermatology suggests considering PDT as a treatment option for actinic cheilitis 5
Conventional or daylight PDT can be considered for cutaneous leishmaniasis, particularly in cosmetically sensitive sites, with 94% lesion clearance and parasitological cure in 100% of cases 5, 6

The British Journal of Dermatology recommends considering PDT for acne where standard treatments are ineffective or contraindicated, with a mechanism involving photosensitizing porphyrins in Propionibacterium acnes that generate reactive oxygen species, damaging sebaceous glands and destroying bacteria 5, 7
A randomized trial showed greater reduction in inflammatory and total lesion counts with ALA-PDT followed by adapalene compared to oral doxycycline plus adapalene at 12 weeks 7
Red and blue light combination therapy shows efficacy for mild to moderate acne 8

The British Journal of Dermatology recommends against offering PDT for fungal infections, psoriasis, invasive squamous cell carcinoma, and nodular BCC at high-risk sites 1, 5, 9
Proper parameters, including wavelength specificity, energy density, application time, and treatment protocols, are critical for the legitimacy of red light therapy 4, 2, 6

Isotretinoin increases skin sensitivity to UV radiation, and retinoid therapy enhances the effects of UV radiation, according to the British Journal of Dermatology 10
Patients on isotretinoin should avoid excessive exposure to sunlight and use of sun lamps, as recommended by the British Journal of Dermatology 10
Red light therapy (wavelengths 630-700nm) is distinct from UV light and does not carry the same photosensitivity risks as UV exposure, as stated by the Journal of the American Academy of Dermatology 11, 12, 13

The American Academy of Dermatology conditionally recommends against adding pneumatic broadband light to adapalene 0.3% gel for acne treatment, due to lack of benefit and risks of hyperpigmentation and purpura 14
Use red light therapy (not UV or broadband light) if pursuing light-based treatment while on isotretinoin, as suggested by the Journal of the American Academy of Dermatology 14
Avoid photodynamic therapy (PDT) that combines photosensitizing agents with light activation, as this would compound photosensitivity risks, according to the Journal of the American Academy of Dermatology 11, 12, 13
Do not use UV-based phototherapy or tanning beds while on isotretinoin, as recommended by the British Journal of Dermatology 10
Avoid broadband light therapies that may include UV wavelengths, as suggested by the American Academy of Dermatology 14