The Complete Guide to Blue Light Therapy for Acne

Acne vulgaris, commonly known as acne, affects millions of people worldwide. Among the many topical products, prescription medications, lifestyle changes and other therapies recommended to treat this common condition, one treatment gaining popularity is blue light therapy.

With its non-invasive, drug-free approach, and little to no side effects, blue light therapy offers a promising solution for inflammatory acne thanks to its antibacterial properties. Discover how this innovative treatment can help you on the path to clear skin.

Understanding Acne

Before diving into blue light therapy, it’s crucial to understand the root cause of acne. This common skin condition arises from a combination of factors, including:

  • Excess sebum production: Sebum is an oily substance naturally produced by your skin to keep it lubricated and protected. However, hormonal fluctuations can trigger your sebaceous glands to produce an excessive amount of sebum, leading to clogged pores and blemishes.
  • Dead skin cell buildup: When dead skin cells fail to shed properly, they can accumulate and create a barrier, further hindering the flow of sebum and promoting clogging.
  • Bacteria: While numerous bacteria naturally live on our skin, one specific type, Propionibacterium acnes (P. acnes), plays a significant role in acne development. This bacteria thrives in sebum-filled pores and breaks down fatty acids, creating inflammatory byproducts called porphyrins that contribute to breakouts.

There are various types of acne ranging from mild to severe. On the milder side are blackheads, whiteheads and pimples, while more severe acne can involve painful nodules and cysts.

Although facial acne is the most visible type of acne, it can also occur on the chest, back and buttocks.

What is Blue Light Therapy?

Blue light therapy, also known as blue LED therapy or phototherapy, utilizes specific wavelengths of blue light to target and potentially improve various skin conditions, including acne. It’s performed using a device covered in light-emitting diodes (LEDs) that emit blue light at wavelengths typically in the range of 400–480 nanometers. 

Blue light treatments are believed to interact with the skin in two ways:

  • Targeting P. acnes: Blue light directly impacts P. acnes, the most proliferant acne-causing bacteria on your skin. The specific wavelengths might disrupt their cell membrane function, hindering their growth and ability to contribute to breakouts.
  • Reducing inflammation: Blue light therapy may also possess anti-inflammatory properties. By potentially reducing inflammation within the pores, it could help lessen the redness and swelling associated with acne lesions.

Types of blue light therapy

There are two main types of blue light therapy for acne.

In-office treatments are performed by a dermatologist using high-intensity light sources, these treatments typically require multiple sessions at the doctor’s office.

At-home blue light devices are becoming increasingly available for home use. These devices generally emit lower-intensity blue light and are intended for daily or regular use as part of a skin care routine in the treatment of acne. For best results, choose an LED device that’s FDA cleared and emits light in the proper wavelength range.

How Does Blue Light Therapy Treat Acne?

While blue light therapy’s ability to improve acne is well established, the exact mechanisms and its overall effectiveness are still being studied and refined. However, it is believed to work through several pathways:

  • Directly targeting P. acnes: As mentioned earlier, blue light may directly inhibit the growth and activity of P. acnes bacteria, reducing their population within the pores and potentially preventing future breakouts.
  • Reducing sebum production: Some studies suggest that blue light therapy might help regulate sebum production. By potentially moderating sebum levels, it could help prevent clogged pores and minimize the environment conducive to P. acnes growth.


  • Non-invasive and painless: Unlike some acne treatments, blue light therapy is a non-invasive procedure that generally doesn’t cause discomfort.
  • Suitable for mild to moderate acne: This therapy might be an option for individuals with mild to moderate acne, particularly those seeking a gentler alternative to topical medications.
  • Complementary treatment: Blue light therapy can be used alongside other acne treatments, potentially enhancing their effectiveness.

Side effects

Blue light therapy is generally well-tolerated, with minimal side effects reported in most cases. However, it’s important to be aware of some potential drawbacks:

  • Mild irritation: Temporary redness, dryness or mild itching may occur in some individuals, especially with extended use or high-intensity devices. These effects typically subside on their own shortly after treatment.
  • Skin sensitivity: If you have sensitive skin, consult a dermatologist before using blue light therapy to assess your suitability and minimize the risk of irritation.
  • Limited research: While research is ongoing, the long-term safety and efficacy of blue light therapy, particularly at-home devices, require further investigation.

Important considerations

  • Consult a dermatologist: Before starting any new treatment, including at-home blue light therapy devices, it’s crucial to consult a board-certified dermatologist. They can assess your individual needs, determine if blue light therapy is suitable for your specific acne type and severity and recommend the appropriate approach.
  • Follow usage instructions: If you choose to use an at-home device, ensure you follow the manufacturer’s instructions carefully regarding treatment duration, frequency and proper placement on the skin.
  • Realistic expectations: Blue light therapy may not be a miraculous cure for everyone. It might work best in conjunction with other acne management strategies, and individual results may vary.

What Kind of Acne Can Blue Light Treat?

Blue light wavelengths are most effective in the treatment of inflammatory acne. This type of acne is characterized by red, swollen and sometimes painful pimples. The light penetrates the skin’s layers to calm inflammation and reduce the size and redness of pimples. It’s also most appropriate for individuals with mild to moderate acne, characterized by occasional breakouts and a moderate number of lesions.

Blue light is less effective on noninflammatory acne lesions such as blackheads, which are better off treated with sebum-fighting serums, peels and cleansers containing salicylic acid, chemical or manual exfoliation and if necessary, extraction. 

If you have severe cystic acne or nodules, blue light therapy treatments may not penetrate deeply enough to impact the bacteria. However, it may be useful as one branch of a multi-pronged approach to healing your acne from the inside out.

How Long Does Light Therapy Take to Work for Acne?

The timeframe for seeing noticeable results from light therapy for acne can vary depending on several factors, including:

  • Type of light therapy: Blue light therapy is typically used for inflammatory acne and may show initial improvements within several weeks of consistent use. Red light therapy, on the other hand, focuses on reducing inflammation and promoting healing, and may take longer, around 4-6 weeks, to show its full effect.
  • Severity of acne: For mild acne cases, results may appear faster compared to moderate or severe cases.
  • Individual factors: Each person’s skin responds differently to treatment. Some individuals may see noticeable changes sooner, while others may require a longer commitment.
  • Treatment frequency and duration: The recommended frequency and duration of light therapy sessions can vary depending on the specific device and your dermatologist’s advice. Generally, consistent and regular use over several weeks is the key to achieving  meaningful results.

How Often Should I Get Blue Light Therapy?

The frequency of blue light therapy sessions can vary based on several factors, including the severity of your acne, your skin type and how well your skin responds to the treatment. Generally, a series of treatments is recommended to achieve the best results. Here’s a closer look at what you might expect:

Initial Treatment Phase: Typically, blue light therapy sessions are scheduled about once or twice a week for the first few weeks. This initial phase allows your skincare professional to assess how your skin is responding to the treatment and adjust the frequency as needed.

Maintenance Phase: After the initial treatment phase, you may enter a maintenance phase where the sessions are less frequent. This could mean receiving treatments every two weeks or even once a month, depending on your specific needs and the advice of your skincare professional.

Remember that everyone’s skin is unique. Some individuals might see significant improvements with fewer sessions, while others may require more frequent treatments to achieve desired results. Your provider will tailor the treatment plan to your specific situation.

In some cases, blue light therapy is used in conjunction with other treatments, such as topical creams or medications. The frequency of blue light therapy sessions might be adjusted based on how these combined treatments are scheduled and how your skin is responding.

Finally, regular follow-up appointments with your skin care professional are crucial. These appointments allow for the assessment of your skin’s progress and any necessary adjustments to your treatment plan, including the frequency of blue light therapy sessions.

Other Types of Light Therapy for Acne

Blue light therapy isn’t the only type of visible light therapy that can help tame breakouts. Here’s a quick guide to some of the other wavelengths used in the treatment of acne, including what aspects of the condition they address and who they’re best suited for.

Red light therapy for acne

Blue and red light therapy are the most popular types of LED light therapy for acne management, but they address different aspects of the condition. While blue light targets P. acnes bacteria, aiming to reduce their population and prevent breakouts, red light primarily addresses the body’s inflammatory response, helping the body to heal faster. 

Red light therapy works by triggering production of ATP, the energy currency of your cells, encouraging them to replicate and heal faster. In addition to fighting inflammation, red light therapy has multiple anti-aging benefits, with the ability to treat fine lines and hyperpigmentation, and can help heal chronic skin conditions such as psoriasis. 

The choice between blue and red light therapy depends on your specific needs and concerns. For concerns about active breakouts and reducing P. acnes bacteria, blue light therapy might be a better option. For concerns about overall redness, inflammation and acne scarring, red light therapy might be more suitable.

In many cases, a combination of red and blue light therapy is the most effective treatment for managing breakouts. For that reason, many devices are equipped with both kinds of light.

Photodynamic therapy for acne

Both blue light treatments and photodynamic therapy (PDT) utilize light technology to target acne, but they differ in their approach and mechanism of action. 

Photodynamic therapy (PDT) involves applying a photosensitizing medication (a topical cream that makes your skin more sensitive to light) to the skin followed by exposure to specific wavelengths of light. The medication is absorbed by bacteria and activated by the light, leading to the destruction of P. acnes. Side effects include temporary redness, swelling and sun sensitivity after treatment. 

PDT may be more effective for moderate to severe acne, potentially offering longer-lasting results compared to blue light therapy alone. But unlike blue light therapy, photodynamic therapy can be solely performed by dermatologists in a clinical setting.

The choice between blue light therapy and PDT depends on several factors. PDT might be a better option for moderate to severe acne, while blue light therapy may be suitable for milder cases. Another trade-off is the convenience of at-home blue light therapy versus the potentially stronger effects of in-office PDT under professional supervision.

Do At-Home Blue Light Therapy Devices Really Work?

The effectiveness of at-home blue light therapy devices for acne management is still under investigation. While some studies suggest potential benefits, particularly in reducing mild inflammatory acne, more research is needed to establish conclusive evidence.

At-home devices come with varying specifications and light intensity levels. Choose a reputable brand–ideally one that’s FDA cleared–and following usage instructions are crucial.

As with any treatment, individual results may vary depending on factors like acne severity, skin type and overall skin care routine.

Consulting a dermatologist is highly recommended before using any at-home device to ensure its suitability for your specific needs and to receive guidance on incorporating it effectively into your skin care routine.

Is Too Much Blue Light Bad For Your Skin?

While blue light therapy shows promise for treating acne, the question of whether “too much” blue light in general is bad for your skin is a complex issue with ongoing research. Here’s what we know:

The sun is the primary source of blue light, and excessive sun exposure, particularly without proper protection, can contribute to premature aging, wrinkles and hyperpigmentation. However, the specific wavelengths emitted by blue light therapy devices differ from those in sunlight and don’t include ultraviolet rays–the type of wavelength that damages skin.

Electronic devices like smartphones, computers and televisions also emit blue light. While concerns exist about potential long-term effects from prolonged exposure, current research suggests the intensity of blue light emitted from these devices is likely much lower than what could be harmful to the skin.

Regardless of whether you choose blue light therapy, practicing good sun protection habits is the best way to maintain your skin’s overall health. We recommend daily use of a broad-spectrum sunscreen of SPF 30 or higher, seeking shade during peak sun hours and covering your skin with long sleeves and wide-brimmed hats. 


Blue light therapy, with its non-invasive nature and minimal side effects, offers a new avenue for those seeking an alternative to traditional acne treatments. The journey to clear skin, however, isn’t one-size-fits-all. Blue light therapy, while effective for many, may not be the ultimate solution for all types of acne or all individuals. It’s essential to approach this treatment with realistic expectations, understanding that it often works best in combination with other acne management strategies. 

If you’re considering blue light therapy, whether in a professional setting or through at-home devices, following all the recommended treatment protocols is key. Remember, patience and consistency are your allies in the fight against acne. Results may take time, but the potential for clearer skin is within reach.

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