By Aliki Chatzilias, MSc.
Clinical Biochemist/Medical Researcher


In the realm of skincare, LED rejuvenation has gained significant popularity due to its non-invasive nature and promising results. However, as with any cosmetic procedure, it's crucial to have a comprehensive understanding of potential side effects and adverse reactions associated with the treatment. This article aims to shed light on these aspects, allowing individuals to make informed decisions about their skincare routines.

Understanding LED Rejuvenation

LED therapy involves the utilization of specific wavelengths of light to stimulate cellular activity in the skin. Red, blue, and green LED lights are commonly used for different therapeutic purposes. Red light, for instance, promotes collagen production and reduces inflammation, while blue light targets acne-causing bacteria. Green light helps address pigmentation issues. These treatments are known for their benefits, but it's important to be aware of the potential effects they might have on the skin.


Common Expected Effects

Many individuals experience positive outcomes from LED rejuvenation, such as improved skin texture and reduced blemishes. Following treatment guidelines is essential to maximize these benefits. Users often notice enhanced radiance, minimized fine lines, and a smoother complexion. Consistency in treatment duration and frequency is key to achieving these desired effects. However, it's important to understand that individual responses can vary due to factors like skin type and existing skin conditions.

Potential Side Effects

Redness and Irritation: A common side effect of LED therapy is temporary redness and irritation. This occurs as the light stimulates blood flow to the treated areas. The skin may appear flushed, but this reaction typically subsides within a few hours. To manage this, applying a soothing, hydrating moisturizer post-treatment can alleviate discomfort. Opting for lower intensity settings during initial sessions can also minimize the likelihood of pronounced redness.

Dryness and Peeling: Some users might experience mild dryness and peeling after LED treatment. This can be attributed to the cellular turnover induced by the therapy. To counter this effect, it's advisable to use a gentle exfoliant and moisturizer to prevent excessive dryness. Hydration is crucial during this phase, and a diligent skincare routine will aid in maintaining the skin's moisture barrier.

Photosensitivity: LED rejuvenation can render the skin more sensitive to sunlight. It's imperative to wear broad-spectrum sunscreen with a high SPF to shield the skin from UV rays. Applying sunscreen daily, even on cloudy days, and avoiding prolonged sun exposure for a few days post-treatment will reduce the risk of sunburn and photosensitivity reactions.

Temporary Darkening of Hyperpigmentation: Individuals with hyperpigmentation concerns might notice a temporary darkening of affected areas after LED treatment. This is a normal part of the healing process as pigmented cells rise to the surface before shedding. It's essential to exercise patience during this phase, as the skin will eventually reveal a brighter and more even complexion.

Less Common Adverse Reactions

Allergic Reactions: While rare, some individuals might experience allergic reactions to components of the LED treatment, such as topical gels or serums. Symptoms can range from itching to hives. Conducting a patch test before the treatment is recommended to identify any potential allergies. If an allergic reaction occurs, immediate discontinuation of the treatment is advised, followed by consultation with a dermatologist.

Severe Irritation or Burns: Instances of severe irritation or burns are extremely uncommon and often stem from improper device usage or neglecting recommended exposure times. Following guidelines for treatment duration and intensity is crucial to preventing such adverse reactions. If blistering, intense pain, or significant irritation occurs, seek medical attention promptly.

Exacerbation of Existing Skin Conditions: Some individuals with pre-existing skin conditions, such as eczema or rosacea, might experience exacerbation of their conditions after LED rejuvenation. It's recommended to consult a dermatologist before undergoing the treatment to evaluate potential risks and benefits. Dermatologists can provide personalized recommendations to mitigate adverse reactions.


Minimizing Risks and Ensuring Safety

Consultation with a Professional: Before beginning LED therapy, consulting a dermatologist or licensed esthetician is vital. They can evaluate your skin type, existing conditions, and medical history to determine if LED rejuvenation is suitable for you. Professionals can also customize treatment plans to address specific skin concerns effectively.

Patch Testing: Prior to undergoing a full treatment session, performing a patch test is recommended. Apply the LED treatment to a small, inconspicuous area of skin and observe any adverse reactions over 24 hours. This precautionary step helps identify potential allergic reactions or excessive skin sensitivity.

Following Guidelines: Adhering to recommended treatment duration, frequency, and intensity is essential to minimize risks. Overusing LED devices or exceeding safe exposure times can lead to adverse effects. Be patient and gradual in increasing treatment duration to allow your skin to adjust and avoid potential problems.


LED rejuvenation offers an array of benefits for various skin concerns, but understanding the potential side effects and adverse reactions is imperative. By being aware of the possibilities and following expert advice, individuals can make well-informed choices about integrating LED therapy into their skincare routines. Prioritizing safety, consulting professionals, and practicing responsible usage will contribute to a positive and satisfying LED rejuvenation experience.