Photobiomodulation is the term used for treatments that apply selected wavelengths of light to influence biological activity without intentionally heating, burning, or removing tissue.
In aesthetic care, you may hear it discussed as red light therapy or low-level light therapy. Those descriptions overlap, but the details of the device and treatment protocol matter more than the name alone.
How does it work?
Light carries energy in particles called photons. When certain molecules in cells and tissues absorb that light, the exposure can influence cellular activity.
Researchers have investigated effects involving mitochondrial function, cellular signaling, inflammation, and tissue repair. These are possible mechanisms behind treatment—not a promise that every light device produces every proposed benefit.
Wavelength, light intensity, treatment duration, distance from the skin, and frequency of use all affect the exposure.
Is photobiomodulation the same as laser resurfacing?
No. Ablative resurfacing intentionally removes tissue and creates an injury that prompts healing and remodeling. Photobiomodulation is intended to influence tissue without creating that type of wound.
Both LEDs and appropriately configured lasers can deliver photobiomodulation. It is inaccurate to assume that LEDs always provide gentle therapy while every laser necessarily burns or wounds the skin.
The treatment’s effect depends on how the energy is delivered.
What can it do for skin?
Certain devices and protocols have been studied for improving the appearance of fine lines and supporting recovery in specific circumstances.
However, evidence for one device, treatment setting, or medical application cannot automatically be applied to another. A device cleared for wrinkles should not be presented as a proven treatment for every inflammatory or healing concern.
Ask what improvement is supported for the exact device being used and how progress will be assessed.
What does treatment feel like?
LED treatment is generally noninvasive, but comfort varies with the device and exposure. Some systems produce noticeable warmth.
Light therapy should not be painful. Report excessive heat, discomfort, or unexpected skin changes rather than extending treatment in the hope of getting a stronger result.
Longer or more frequent exposure is not automatically more effective.
Who should discuss suitability first?
Tell your provider about medications, photosensitivity, eye conditions, and any history of pigmentation worsening with warmth.
If you recently had a procedure, follow the treating clinician’s instructions about when light therapy is appropriate. A device marketed for healthy skin is not automatically suitable for freshly treated or injured skin.
Use eye protection and skincare products according to the specific device instructions.
Where does it fit in a skin plan?
Photobiomodulation may be a supporting treatment for an appropriate patient and goal. It does not replace daily sun protection or provide the same changes as resurfacing, injectables, or surgery.
At Modern Aesthetics in San Jose, I consider light therapy in the context of your skin, current routine, and overall treatment plan. Schedule a consultation to discuss whether it offers a useful benefit for your concerns.
Updated October 23, 2026.