LED photobiomodulation is among the procedures with the best safety profile in dermatology. However, this is not the same as "without any effects." Here's what you can realistically expect.
What is Normal
| Effect | Duration |
|---|---|
| Slight redness after a session | 10–30 minutes |
| Sensation of warmth during the procedure | Passes immediately |
| Mild skin dryness | First 1–2 weeks |
| Afterimage in front of eyes | Several minutes |
All of these are expected and do not require action.
What is Not Normal
Stop and consult a dermatologist if you experience:
- Pain or burning during the session. Correct LED therapy is painless.
- Blisters or peeling — this is thermal damage, not photobiomodulation.
- Redness lasting over 24 hours.
- Darkening of spots — see LED and Melasma.
- Visual disturbances — see eye safety.
Most of these cases are associated with devices without specified power or with poor heat dissipation.
Initial Acne Purge
Some people report a slight worsening during the first 1–2 weeks in blue light mode. This is usually transient and resolves. If it persists for more than four weeks, discontinue use.
Who is at Higher Risk
- Taking photosensitizing medications — some antibiotics, oral retinoids, some diuretics.
- Active rosacea — see LED for Rosacea.
- Melasma or tendency for hyperpigmentation.
- Recent cosmetic procedures — wait for the recommended period.
How to Reduce Risk
- Start with shorter sessions and 2–3 times a week.
- Clean, dry skin — no active serums before the procedure.
- Do not extend sessions — longer is not better.
- Hydrate after the session.
- Choose a device with published power in mW/cm².
Frequently Asked Questions
Can LED burn the skin? Correct non-thermal LED therapy — no. A device that heats up noticeably — yes.
Does it lead to addiction? No. There is no described rebound effect after discontinuation — the effect simply gradually diminishes.
Can I use it every day? You can, but it's not necessary. See how often to use an LED mask.
Related Articles
Sources
- Avci P et al. Semin Cutan Med Surg. 2013.
- IEC 62471 — Photobiological safety of lamps and lamp systems.
This article is for informational purposes only and does not substitute medical advice.
