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The Skin Doctor

Actinic keratosis (AK) treatment at The Skin Doctor focuses on clearing both the visible AKs and the surrounding sun-damaged field. Options include laser-assisted PDT, topical 5-fluorouracil (Efudix), topical imiquimod (Aldara) and focal cryotherapy. All patients are reviewed at 6–8 weeks and enrolled in long-term surveillance.

AK / SCC pre-cancer

Actinic Keratosis Treatment

Actinic keratosis (AK) treatment at The Skin Doctor focuses on clearing both the visible AKs and the surrounding sun-damaged field. Options include laser-assisted PDT, topical 5-fluorouracil (Efudix), topical imiquimod (Aldara) and focal cryotherapy. All patients are reviewed at 6–8 weeks and enrolled in long-term surveillance.

Portrait of Dr Christopher Irwin

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

Last reviewed 2026-06-06 · Editorial policy

Quick definition

Actinic keratosis (AK) treatment at The Skin Doctor is doctor-led field therapy — treating both the visible AKs and the surrounding sub-clinical sun-damaged field. Our most advanced in-clinic option is laser-assisted photodynamic therapy (LA-PDT) — particularly preferred on face and scalp for its cosmetic outcomes. Alternatives include topical 5-fluorouracil (Efudix) and topical imiquimod (Aldara) as at-home field therapies, and cryotherapy for isolated thicker lesions in non-cosmetically-sensitive sites. All patients are reviewed at 6–8 weeks and enrolled in long-term skin surveillance. Treatment is matched to lesion count, location, thickness, your skin type and downtime tolerance.

Actinic keratoses (also called solar keratoses) are rough, sun-damaged patches that form on chronically sun-exposed skin — face, scalp, ears, forearms and hands. They matter because a proportion can progress to squamous cell carcinoma over time, and because they are a marker of field damage — meaning the surrounding skin has accumulated significant UV injury, not just the visible spots. (1–3,5)

Our treatment philosophy is simple:

  • Confirm the diagnosis (and biopsy anything suspicious for invasive cancer first)
  • Match treatment to your AK pattern — single spot vs widespread field
  • Prioritise long-term control and prevention, not just a quick “spot freeze” (1,2,5)
Book an AK treatment consultation

Looking for the condition background? See Actinic keratosis (condition page) for the full clinical picture, symptoms, dermoscopy and when AK should be biopsied.

Our most prominent option — Laser-assisted PDT (LA-PDT)

Laser-assisted photodynamic therapy combines two proven concepts: photodynamic therapy (PDT) — a photosensitising cream activated by a controlled light source — and laser assistance (an ablative fractional laser creating microscopic channels) to enhance treatment penetration and field coverage. PDT is a recognised treatment option in major international guidelines, particularly where cosmetic outcomes matter (face and scalp). (1,3,5)

Why patients choose LA-PDT — especially for face and scalp:

  • Treats the field, not just the visible spots — important when there are multiple AKs or widespread sun damage (1–3,5)
  • Doctor-led and clinic-controlled — no “did I apply it right?” home-application uncertainty
  • Often excellent cosmetic outcomes compared with repeated freezing in cosmetically sensitive areas (3)
  • Efficient — treatment is delivered in a structured single session with a clear, predictable aftercare timeline

Best suited for:

  • Multiple AKs in one region — “field cancerisation” — particularly face and scalp (including bald scalp) (1–3,5)
  • Patients who want an in-clinic, technology-assisted approach rather than 4–8 weeks of at-home topical reaction
  • Recurrent AKs despite ongoing spot treatment

What to expect — assessment + photos if needed; laser preparation; application of photosensitiser + incubation; controlled light activation; a predictable recovery phase (redness, dryness, crusting/flaking depending on protocol and your skin).

Learn more about Laser-Assisted Photodynamic Therapy (LA-PDT) →

Other evidence-based treatment options

Cryotherapy (freezing) — for isolated thicker lesions in non-cosmetically-sensitive sites

Cryotherapy is a lesion-directed treatment: quick, effective for isolated AKs, and commonly performed at the time of assessment. (1,2)

Pros

  • Fast, in-clinic
  • Ideal for a small number of discrete lesions (1,2)

Cons

  • Does not treat the surrounding field damage
  • Can cause blistering, pigment change, and small white scars where the precancer used to be — especially on thinner skin. (2) This is the main reason cryotherapy is generally not used on the face or anywhere patients do not want scars.

Efudix (5-fluorouracil) — at-home field treatment

Efudix (5-fluorouracil) is one of the most effective field therapies for AKs and is strongly recommended in clinical guidelines. (1,3,4,5) It works by selectively targeting rapidly dividing abnormal sun-damaged cells, which creates a predictable inflammatory reaction before healing. (4) The treated area becomes very red and painful, and often oozes yellow or green exudate (even when not infected).

Best suited for

  • Widespread AKs on face, scalp and forearms
  • Patients who can commit to the full 2–4 week course and the recovery window (1,3,4)

Cons

  • Quite difficult to tolerate on large treatment areas during the course

Aldara (imiquimod) — at-home immune-based field treatment

Aldara (imiquimod) stimulates local immune activity to clear AKs and is also strongly recommended in international guidelines. (1,3,5) It can be particularly useful when an immune-driven approach suits the AK pattern and location.

Best suited for

  • Field treatment — multiple AKs in one area
  • Patients who prefer an immune-modulating option and can manage the reaction phase (1,3,5)

Cons

  • Quite difficult to tolerate on large treatment areas — full course often runs 6–8 weeks

How we choose the right option for you

During your consultation we match treatment to:

  • How many lesions you have — single spot vs multiple (1–3,5)
  • Where they are — face and scalp vs limbs; cosmetic priorities and healing differ (1–3,5)
  • Thickness — hyperkeratotic lesions may need debulking or targeted treatment first (2)
  • Your downtime tolerance — single-session in-clinic vs weeks of home cream therapy
  • Your risk profile — immunosuppression, prior skin cancers, rapid recurrence (2,3,5)

Prevention and long-term control

Even after successful treatment, AKs often recur because the underlying UV damage to the skin remains. Evidence-based prevention includes:

  • Consistent UV protection — daily broad-spectrum SPF 50+, hats, sun-protective clothing and shade (1–3,5)

  • Ongoing skin checks where appropriate

  • Treating “field change” proactively rather than chasing individual spots forever (1–3,5)

  • How to reduce your risk of skin cancer

  • Book a full skin check

Book a consultation

Book an AK treatment consultation LA-PDT for AK

What to expect

  1. Consultation and assessment

    A skin cancer doctor reviews your sun damage, photographs the area, and identifies any suspicious lesions that need biopsy before field therapy. The most suitable treatment modality is chosen based on the field, your skin type and your preferences.

  2. Preparation

    For laser-assisted PDT, the treatment area is cleansed and gently debrided. For topical treatments (Efudix, Aldara), you receive a clear instruction sheet, sample dosing schedule and what to expect during treatment.

  3. Treatment delivery

    Laser-assisted PDT — a fractionated laser creates wells in the skin, a sensitising cream is applied and allowed to absorb, then an LED light is used to activate the cream and destroy atypical cells. Topical creams — applied at home twice daily for 2–4 weeks (Efudix) or several weeks (Aldara). Cryotherapy — a brief liquid nitrogen freeze for individual thicker lesions.

  4. Aftercare

    The treated field becomes red, scaly, sometimes blistered, and crusted for around 7–14 days. We provide a written aftercare plan with gentle cleansing, moisturiser, SPF 50+, and what to watch for.

  5. Follow-up review

    We re-assess the treated area at around 6–8 weeks to confirm clearance and plan ongoing surveillance. Patients with widespread sun damage often need ongoing skin checks every 6–12 months.

Results timeline

  • First few days post-treatment Redness, swelling, scaling and crusting across the treated field. This is normal and indicates the treatment is working.
  • 7–14 days Crust separates, skin re-epithelialises. The treated field looks pink and fresh.
  • 6–8 weeks Field reviewed for clearance. Any residual or new AKs treated with a focused approach. Decisions made about ongoing field therapy frequency.
  • Ongoing Annual or 6-monthly skin checks and field therapy as needed. Daily SPF 50+ remains essential.

Ideal candidate

  • Patients with multiple actinic keratoses (sun spots) in a sun-damaged "field" on the face, scalp, neck, forearms or hands.
  • Patients who have had skin cancers in a sun-damaged area and want to reduce the chance of further AKs and SCCs.
  • Patients keen on field therapy rather than chasing individual lesions one by one with cryotherapy.
  • Immunosuppressed patients (eg. transplant recipients) who have a higher rate of AKs and SCCs.
  • Patients without active infection, open wounds or photosensitivity in the area to be treated.

Frequently asked questions

  • Are actinic keratoses skin cancer?
    They are precancerous sun-damage lesions. Technically the difference between actinic keratosis and early squamous cell carcinoma in situ (SCC in situ / Bowen's disease) is depth — in SCC in situ the same dysplastic cells extend through the full thickness of the epidermis. Some AKs progress to invasive squamous cell carcinoma, and they signal a higher-risk sun-damaged field of skin around them.
  • Is laser-assisted PDT better than topical creams?
    It depends on your AK pattern, location and goals. Guidelines strongly support both topical 5-fluorouracil (Efudix) and imiquimod (Aldara) as effective field therapies. Laser-assisted PDT is also strongly recommended in current guidelines and is often preferred where cosmetic outcomes matter (face, scalp) or where patients want a clinic-controlled, single-session, technology-assisted pathway rather than 4-8 weeks of at-home cream therapy with weeks of visible reaction.
  • Which treatment is right for me?
    It depends on how many AKs you have, where they are, how thick they are, your skin type, and how much downtime you can manage. Patients with widespread thin AKs across a field often benefit most from laser-assisted PDT or topical creams. Individual thicker AKs are often spot-treated with cryotherapy. We discuss the options at consultation.
  • Does field therapy hurt?
    Laser-assisted PDT can cause a stinging or burning sensation during the LED light activation phase. We minimise this with cooling and short pauses. Topical creams cause inflammation, redness and irritation in the treatment area — this is expected and is part of how the treatment works. Cryotherapy is quick and causes a brief stinging sensation followed by a blister.
  • How long is the downtime?
    The treated field becomes red, scaly and crusted for around 7–14 days after laser-assisted PDT. Topical creams produce inflammation over the weeks of treatment (4 weeks Efudix, often 6-8 weeks Aldara). Cryotherapy heals in 1–2 weeks per spot.
  • Will the AKs come back?
    Field therapy clears visible AKs and reduces the rate of new AKs and SCCs over time, but ongoing UV exposure can produce new lesions because the underlying sun damage to the skin remains. Daily SPF 50+, hats, protective clothing and regular skin checks are essential. Many patients with widespread sun damage benefit from repeat field therapy every 1–2 years.
  • I'm immunosuppressed — does this change anything?
    Immunosuppressed patients (eg. transplant recipients, patients on long-term systemic immunosuppression) have a much higher rate of AKs and squamous cell carcinomas. We typically recommend more aggressive and more frequent field therapy plus closer surveillance — often 3 or 6-monthly skin checks rather than annual.
  • Do I need a referral?
    No referral is required. You can book directly via the booking panel in the sidebar. Both clinics — Ivanhoe and Diamond Creek — see actinic keratosis patients. If you have a referral from your GP or dermatologist for our records we welcome it, but it is not required to book or to be seen.

References

  1. Guidelines of care for the management of actinic keratosis — Executive summary. J Am Acad Dermatol. 2021. (American Academy of Dermatology guideline.)
  2. Pre- and post-treatment care for actinic keratoses — an Australian and New Zealand perspective. AJGP. 2025.
  3. Randomized Trial of Four Treatment Approaches for Actinic Keratosis. N Engl J Med. 2019. (Head-to-head RCT comparing 5-fluorouracil, imiquimod, MAL-PDT and ingenol mebutate.)
  4. Actinic keratoses — a guide to treatment with 5-fluorouracil cream. Medicine Today. 2023; 7(1):13-16. (Adamson SR, Chong AH, Foley P — Australian practice-focused review.)
  5. European consensus-based interdisciplinary guideline for diagnosis, treatment and prevention of actinic keratoses, epithelial UV-induced dysplasia and field cancerisation. J Eur Acad Dermatol Venereol. 2024.

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Medically reviewed by Dr Christopher Irwin, MBChB, FRACGP, MMed (Skin Cancer), FACAM, MSCCA · Last reviewed 2026-06-06 · Editorial policy