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Doctor-led comparison of LED, Nd:YAG laser (Fotona SP Dynamis) and photodynamic therapy (PDT) for acne in Melbourne. LED is the gentlest entry point. Nd:YAG is an adjunct for deeper or red acne. PDT is the most intensive, for persistent cases. Er:YAG addresses atrophic scarring once acne is controlled. Layered on skincare and prescription therapy, not used standalone.

Acne

LED vs Laser vs PDT for Acne — Choosing the Right In-Clinic Technology

Doctor-led comparison of LED, Nd:YAG laser (Fotona SP Dynamis) and photodynamic therapy (PDT) for acne in Melbourne. LED is the gentlest entry point. Nd:YAG is an adjunct for deeper or red acne. PDT is the most intensive, for persistent cases. Er:YAG addresses atrophic scarring once acne is controlled. Layered on skincare and prescription therapy, not used standalone.

Portrait of Dr Christopher Irwin

By Dr Christopher Irwin, MBChB, FRACGP, MMed (Skin Cancer), FACAM, MSCCA

Last reviewed 2026-06-06 · 11 min read · Editorial policy

Quick definition

LED, laser and photodynamic therapy (PDT) are in-clinic light-based treatments used as adjuncts in an acne plan. LED uses blue and red wavelengths to reduce bacteria and inflammation — the gentlest option. Nd:YAG laser (Fotona SP Dynamis at our clinic) penetrates deeper and targets inflammation and acne-related redness. PDT combines a topical photosensitiser (usually ALA) with a light source to suppress sebaceous activity, and is the most intensive option. These technologies almost always sit on top of a skincare or prescription plan — not in place of one. The right choice depends on your acne type, skin sensitivity, and tolerance for downtime.

A practical guide to choosing the right in-clinic technology for acne in Melbourne — based on acne type, downtime, and evidence.

LED, laser and PDT can all be helpful for acne, particularly when breakouts are persistent, inflammatory, or when you would like to reduce reliance on oral medication. The medical literature also makes an important point: while many studies show benefit, protocols vary and high-quality comparative trials are still evolving. (1–3)

This page explains what each option does, who it suits best, and how we decide which pathway is most appropriate.

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The key differences in one sentence each

  • LED: gentle anti-inflammatory and antibacterial support, best for mild–moderate inflammatory acne and sensitive skin. (4,5)
  • Nd:YAG laser (Fotona SP Dynamis): deeper-penetrating treatment used as an adjunct to reduce inflammation and support oil-gland modulation in selected acne patterns. (6–8)
  • PDT (ALA + red LED): the most intensive option — targets sebaceous activity and inflammation, but with more downtime and strict post-treatment light avoidance. (9–11)

Which option is right for you?

If you want the gentlest, lowest-downtime option

LED is often the best starting point, particularly if your acne is mild to moderate and inflammatory (red pimples) rather than deep nodules. Evidence supports benefit, and side effects are usually minimal. (4,5)

If you have persistent inflammatory acne and oily skin

Our primary laser approach for acne uses 1064 nm long-pulsed Nd:YAG (Fotona SP Dynamis) as an adjunct to a medical plan. Clinical studies support reductions in inflammatory acne lesions and acne-related redness with Nd:YAG protocols. (6,7)

If acne is treatment-resistant and you can tolerate downtime

PDT may be considered. It can be effective for selected patients, but protocols vary and side effects (pain, redness, crusting, pigment change risk) mean it is not a first-line treatment for most people. (9–12)

Multiple options are often used together — for example LED and Nd:YAG — it is not necessarily either/or. If you are unsure, a consultation is the fastest way to match the right tool to your acne type and skin sensitivity.

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LED therapy for acne

LED uses specific wavelengths of light, most commonly:

  • Blue light — targets bacterial porphyrins
  • Red / near-infrared light — anti-inflammatory and healing support

How it works (simplified)

Blue light is thought to activate porphyrins produced by C. acnes, generating reactive oxygen species that damage bacterial cells. Red light penetrates deeper and supports inflammation reduction and repair. (13,14)

Evidence

Systematic reviews support LED benefit for inflammatory acne, including for portable/at-home devices, though results are usually more modest than structured in-clinic programs. (5)

Best suited to

  • mild–moderate inflammatory acne
  • acne in sensitive or reactive skin
  • patients wanting low downtime
  • patients using topical or prescription therapy who want faster inflammation control

Nd:YAG laser for acne (Fotona SP Dynamis)

Our core laser approach for active acne uses 1064 nm long-pulsed Nd:YAG (Fotona SP Dynamis).

Why Nd:YAG is used

  • penetrates deeper than visible light therapies
  • can target inflammatory pathways and the vascular component of acne redness
  • may support reduced sebaceous activity in selected patterns (1–3,6)

What the evidence shows

A comparative study found 1064 nm long-pulsed Nd:YAG and 595 nm pulsed dye laser were similarly effective for reducing inflammatory acne lesions and acne erythema in mild-to-moderate facial acne. (6) Case-based and clinical reports also support Nd:YAG as a useful adjunct when acne is persistent or when inflammation and redness are prominent. (7,8)

Where it fits best

  • inflammatory acne where topical-only approaches are not enough
  • acne with prominent redness
  • patients who want an in-clinic option but wish to avoid prolonged oral antibiotics (where clinically appropriate)

For our service pathway, see Laser & light therapy for acne →.

Laser support for acne scarring (Er:YAG resurfacing)

Once active acne is under control, Er:YAG laser resurfacing can be used to improve acne scar texture and contour in selected patients. Evidence supports Er:YAG resurfacing for atrophic acne scars, including in darker skin types when patient selection and parameters are conservative. (15–18)

This is not performed as a first step for active acne — it is part of a staged plan:

  1. control active acne first
  2. then treat scars and texture

See Acne scarring treatments → for the full scarring pathway.

Photodynamic therapy (PDT) for acne

PDT combines:

  • a topical photosensitiser (most commonly ALA — aminolaevulinic acid)
  • activation with light (often red LED)

How it works (simplified)

ALA is thought to concentrate in pilosebaceous units and enhance the effect of light activation, leading to sebaceous suppression and inflammatory reduction. (9–12)

Evidence

PDT has many published studies, but there is no universal consensus on the “best” protocol (photosensitiser, incubation, light source, dosing, intervals). Side effects can be significant for some patients (pain, erythema, crusting, post-inflammatory dyspigmentation), which is why it is selected carefully. (9–12)

PDT plus fractional resurfacing (selected cases)

In some patients, fractional resurfacing (such as fractionated Er:YAG) may be used before ALA application to improve photosensitiser uptake into follicles and sebaceous units. This concept is supported by broader photodynamic therapy literature on methods to enhance drug penetration, and is used selectively when maximising response is prioritised over downtime. (11,19)

For our PDT protocols (including standard and advanced options), see Photodynamic acne therapy →.

Other in-clinic adjuncts that can help

Superficial chemical peels

Most useful for predominantly comedonal acne and congestion. Multiple treatments are required and improvements are often modest. (20,21)

Comedone extraction

Can help resistant blackheads and whiteheads when performed carefully — usually as an adjunct rather than a standalone solution. (20)

Intralesional corticosteroid for a large cyst or nodule

A doctor can inject a small amount of dilute steroid into a very inflamed nodule to flatten it rapidly and reduce discomfort. Evidence quality is limited, but clinical experience supports its use for the right lesion. (22)

For brown post-inflammatory marks left after lesions resolve, see Post-inflammatory hyperpigmentation →.

What we recommend in practice

Because evidence quality varies across technologies, we use a practical hierarchy:

  1. start with the least invasive option likely to help
  2. combine technology with an evidence-based skincare or prescription plan (23)
  3. escalate to Nd:YAG laser or PDT selectively based on acne type and tolerance for downtime
  4. reassess at 8–12 weeks before concluding a treatment has “failed” — adherence and diagnosis errors are common reasons for non-response

Book an acne consultation

If you would like a structured plan that matches your acne type, skin sensitivity and downtime tolerance, we will guide you to the right pathway — LED, Nd:YAG laser, PDT, prescriptions, or a combination.

Book an acne consultation

You may also find these helpful:

Frequently asked questions

  • Which in-clinic acne treatment should I start with?
    For most patients, LED is the sensible starting point — it is the gentlest option, has the lowest downtime, and has supportive evidence for mild-to-moderate inflammatory acne. If acne is more inflammatory or oily, or hasn't responded to LED plus a good topical/prescription plan, Nd:YAG laser (Fotona SP Dynamis) is usually the next step. PDT is reserved for persistent or treatment-resistant acne and needs strict light avoidance after treatment.
  • Is LED a replacement for skincare or prescription treatment?
    Usually no. LED works best as an adjunct that helps control inflammation and supports recovery — it does not replace evidence-based topicals (benzoyl peroxide, adapalene, azelaic acid) or, where indicated, prescription therapy. Most patients get the best result when LED is layered on top of a medical plan rather than used as a standalone treatment.
  • Is Nd:YAG laser a stand-alone cure for acne?
    No. Nd:YAG laser reduces inflammatory lesions and acne-related redness, but follicle plugging, sebum production and bacterial colonisation still need to be addressed with skincare, prescription topicals, hormonal therapy or oral antibiotics where appropriate. We use Nd:YAG as part of a structured plan, not as a one-off "fix."
  • How many sessions of laser or LED will I need?
    A typical course is 4–8 sessions spaced 1–4 weeks apart depending on the protocol and your acne pattern, with reassessment at 8–12 weeks. LED is often used more frequently (weekly or twice-weekly), while Nd:YAG is usually spaced further apart. PDT is highly protocol-dependent and may need fewer treatments at wider intervals. Your plan is individualised at consultation.
  • Is PDT the most effective option for acne?
    PDT can be powerful for selected patients, particularly persistent or treatment-resistant inflammatory acne, but it has more downtime, more side effects (pain, redness, crusting, pigment change risk), and no universally agreed protocol. It is not a first-line treatment for most people — we reserve it for cases where lighter options have not delivered enough response or where the patient wants to avoid prolonged oral therapy.
  • Can in-clinic light or laser treatments prevent acne scarring?
    Indirectly, yes. The biggest driver of acne scarring is uncontrolled inflammation, so anything that reduces inflammation sooner — LED, Nd:YAG, PDT, topicals, oral antibiotics, isotretinoin — may reduce scarring risk. The most important factor is bringing active acne under control early, before deep nodules and prolonged inflammation set in. Once acne is controlled, Er:YAG laser resurfacing can address established atrophic scars.
  • Are these treatments safe in pregnancy or for darker skin types?
    LED is considered very safe and is generally fine in pregnancy. Nd:YAG and Er:YAG can both be used safely in skin of colour with appropriate operator settings and patient selection, but parameters are adjusted carefully to reduce post-inflammatory pigmentation risk. PDT is usually avoided in pregnancy. Always tell your treating doctor if you are pregnant, breastfeeding, photosensitive or on photosensitising medications before booking.
  • How much do LED, laser and PDT for acne cost?
    Costs vary by protocol, number of sessions and whether treatment is paired with prescription care. LED is the most accessible option per session; Nd:YAG laser packages are mid-range; PDT (especially with fractional resurfacing) sits at the higher end because of the longer protocol and more involved clinical time. We provide indicative pricing at consultation once we have matched a pathway to your acne type and downtime tolerance.

References

  1. Barbaric J, Abbott R, Posadzki P, et al. Light therapies for acne. Cochrane Database Syst Rev. 2016;(9):CD007917.
  2. Hamilton FL, Car J, Lyons C, et al. Laser and other light therapies for the treatment of acne vulgaris: systematic review. Br J Dermatol. 2009;160(6):1273–1285.
  3. Haedersdal M, Togsverd-Bo K, Wulf HC. Evidence-based review of lasers, light sources and photodynamic therapy in the treatment of acne vulgaris. J Eur Acad Dermatol Venereol. 2008;22(3):267–278.
  4. Papageorgiou P, Katsambas A, Chu A. Phototherapy with blue (415 nm) and red (660 nm) light in the treatment of acne vulgaris. Br J Dermatol. 2000;142(5):973–978.
  5. Ershadi S, Barbieri JS. At-home LED devices for the treatment of acne vulgaris: a systematic review and meta-analysis. JAMA Dermatol. 2025;161(6):552–560.
  6. Chalermsuwiwattanakan N, Rojhirunsakool S, Kamanamool N, Kanokrungsee S, Udompataikul M. Comparative efficacy between 1064-nm long-pulsed Nd:YAG and 595-nm pulsed dye laser for acne vulgaris. J Cosmet Dermatol. 2021;20(7):2108–2115.
  7. Tlaker V. Successful therapy of excoriated acne with Nd:YAG laser: a case report. Acta Dermatovenerol Alp Pannonica Adriat. 2017;26(3):73–75.
  8. Gold MH, et al. Current treatments of acne: medications, lights, lasers, and a 1064-nm laser review. J Clin Aesthet Dermatol. 2017.
  9. Sakamoto FH, Lopes JD, Anderson RR. Photodynamic therapy for acne vulgaris: a critical review (Part I). J Am Acad Dermatol. 2010;63(2):183–193.
  10. Qureshi S, Rehan Z, Mukovozov I. Photodynamic therapy in acne vulgaris: a systematic review. J Cutan Med Surg. 2024.
  11. Qiu S, et al. Two-step photodynamic therapy for facial acne reduces pain while maintaining efficacy. Photodiagnosis Photodyn Ther. 2025;46:103351.
  12. Serra-Guillén C, Llombart B, Sanmartín O. Mild photodynamic therapy with BF-200 ALA for acne vulgaris: clinical efficacy and tolerability. J Clin Med. 2024;13(9):2658.
  13. Ashkenazi H, Malik Z, Harth Y, Nitzan Y. Eradication of Propionibacterium acnes by its endogenous porphyrins after blue light. FEMS Immunol Med Microbiol. 2003;35(1):17–24.
  14. Lee WL, Shalita AR, Poh-Fitzpatrick MB. Porphyrin production in P. acnes and P. granulosum. J Bacteriol. 1978;133(2):811–815.
  15. Engin B, et al. Er:YAG laser for atrophic facial acne scars assessed with 22-MHz ultrasonography. J Dermatol. 2012;39(12):982–988.
  16. Wanitphakdeedecha R, et al. VSP Er:YAG laser resurfacing for acne scars in skin phototypes III–V. Dermatol Surg. 2009;35(9):1376–1383.
  17. Chathra N, Mysore V. Variable-pulsed Er:YAG resurfacing for acne scars in Fitzpatrick IV–V. J Cutan Aesthet Surg. 2018;11(1):20–25.
  18. Mani N, Zorman A. High-energy fractional nanosecond Q-switched 1064-nm laser for acne scars. J Cosmet Dermatol. 2021;20(12):3907–3912.
  19. Champeau M, et al. Photodynamic therapy for skin cancer: techniques to enhance photosensitiser penetration. Photodiagnosis Photodyn Ther. 2019;28:308–322.
  20. Kempiak SJ, Uebelhoer N. Superficial chemical peels and microdermabrasion for acne vulgaris. Semin Cutan Med Surg. 2008;27(3):212–220.
  21. Kessler E, Flanagan K, Chia C, et al. Alpha- vs beta-hydroxy acid peels for facial acne. Dermatol Surg. 2008;34(1):45–50.
  22. Levine RM, Rasmussen JE. Intralesional corticosteroids in nodulocystic acne. Arch Dermatol. 1983;119(6):480–481.
  23. Zaenglein AL, Pathy AL, Schlosser BJ, et al. Guidelines of care for the management of acne vulgaris. J Am Acad Dermatol. 2016;74(5):945–973.e33.

Related

Portrait of Dr Christopher Irwin

By Dr Christopher Irwin, MBChB, FRACGP, MMed (Skin Cancer), FACAM, MSCCA

Last reviewed 2026-06-06 · Editorial policy