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The Skin Doctor

Aldara (imiquimod) is a prescription immune-activating cream for selected thin skin cancers and sun-damage pre-cancer. We use it mainly for superficial BCC, SCC in situ (Bowen's disease) and, in selected cases, actinic keratosis. A typical course is once daily, 5 days per week, for 6 weeks, with a progressive inflammatory reaction during treatment.

Immune-activating cream

Aldara (imiquimod) Cream

Aldara (imiquimod) is a prescription immune-activating cream for selected thin skin cancers and sun-damage pre-cancer. We use it mainly for superficial BCC, SCC in situ (Bowen's disease) and, in selected cases, actinic keratosis. A typical course is once daily, 5 days per week, for 6 weeks, with a progressive inflammatory reaction during treatment.

Portrait of Dr Christopher Irwin

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

Last reviewed 2026-06-06 · Editorial policy

Aldara Pump — imiquimod 5% w/w cream, two dispenser pumps (approx 62 mg per actuation), a prescription-only topical immunotherapy
Aldara (imiquimod) 5% cream — the prescription immune-activating cream used for selected superficial skin cancers and actinic keratosis.

Aldara (imiquimod) is a prescription immune-activating cream used to treat selected, thin skin cancers and sun-damage pre-cancer. At The Skin Doctor, we use Aldara (imiquimod) mainly for:

If you’re deciding between topical treatments, also read:

When Aldara (imiquimod) is a good option

Aldara (imiquimod) can be a good choice when:

  • The lesion is confirmed (often by biopsy) to be suitable and thin/superficial.
  • You want to avoid (or delay) surgery where appropriate.
  • The location or your scarring preference makes a non-surgical approach attractive.

Aldara (imiquimod) is not suitable for every lesion. Depth, subtype, location, immune status and diagnostic certainty matter.

If you have one to three spots you’re worried about, start with a Targeted Skin Spot Check.

How Aldara (imiquimod) works

Aldara (imiquimod) activates immune signalling in the skin (including Toll-like receptor pathways), which helps your body recognise and destroy abnormal cells. 1

A key concept: Aldara (imiquimod) works by creating an immune reaction. Some redness and inflammation is expected — and often correlates with response — but we still want the reaction to remain safe and controlled.

How effective is Aldara (imiquimod)?

For properly selected superficial lesions, studies show clearance rates in the roughly 70–80% range depending on the protocol and how clearance is defined (clinical versus histological). 2,3,4

For context, surgical removal of a suitable low-risk lesion usually has a higher cure rate (around 97% for low-risk lesions), but involves a scar and surgical downsides. 5

What patients often like about Aldara (imiquimod):

  • usually minimal scarring
  • no cutting, stitches or surgical wound care
  • treatment is done at home (with structured follow-up)

Aldara (imiquimod) vs Efudix (5-fluorouracil): which is “easier”?

People often find Aldara (imiquimod) more tolerable than Efudix (5-fluorouracil), but reactions vary widely.

If you’re treating actinic keratoses (AK), we often prefer Efudix (5-fluorouracil) — it tends to be more convenient and predictable, and in head-to-head trials it clears AK more effectively than imiquimod — but Aldara (imiquimod) can still be appropriate in selected situations. 6

Compare: Efudix (5-fluorouracil).

How to use Aldara (imiquimod)

Your exact plan should come from your doctor. A common regimen for selected superficial skin cancers is:

  • Apply Aldara (imiquimod) once daily, 5 days per week, for 6 weeks.

How much to use

More is not better. A practical guide:

  • A thin film is the goal.
  • A pea-sized amount is usually enough for a small lesion area.
  • By about 10 minutes after applying, you generally shouldn’t see visible white cream sitting on the skin.

Step-by-step

  1. Timing — apply 2–3 hours before bed so it can absorb and won’t rub off onto bedding.
  2. Clean the area — wash with warm water, avoid harsh cleansers or scrubs, pat dry, then wait 10–15 minutes.
  3. Apply correctly — use a glove (or wash hands thoroughly afterwards). Apply to the lesion plus the margin your doctor recommends (often about 5 mm). Avoid eyes, nostrils, lips and other mucous membranes.
  4. Don’t occlude unless instructed — occlusive dressings can intensify the reaction.
  5. After applying — wash hands well. After about 20 minutes you can apply moisturiser, sunscreen and/or makeup as needed.
  6. Treatment area limits — do not treat large areas unless specifically instructed.
  7. Review after treatment — we normally review the area after the course is finished (often including dermoscopy) to check response and decide if further treatment or biopsy is needed.

What to expect during treatment

A typical timeline:

  • Week 1–2 — mild redness/itching can start.
  • Week 3–6 — inflammation often ramps up (redness, crusting, soreness).
  • After finishing — the area gradually settles over weeks, and the final appearance continues to improve.

Some areas (for example, the side of the nose) can swell and look dramatic. This can be normal — but if you’re worried, contact your treating doctor.

Side effects and risks

Common local effects

  • redness, burning, itching
  • crusting / scabbing
  • swelling
  • weeping or mild erosions

Pigment change

Any significant inflammation can disrupt pigment cells and cause lighter or darker patches. Risk is higher with UV exposure during or after treatment.

Strict sun avoidance and sunscreen are important during treatment and for weeks afterwards.

Scarring (uncommon)

Most people do not scar, but intense inflammation can occasionally cause scarring. If scarring risk is a major concern, discuss alternatives such as LA-PDT for non-melanoma skin cancer or surgery.

Worsening facial redness / rosacea-type vessels (rare)

Inflammation can sometimes unmask or worsen facial redness. If you already have rosacea or are redness-prone, discuss options first.

Non-healing ulcer

Lower legs have relatively reduced blood supply, and inflammation can occasionally cause delayed healing. Lower-leg lesions are managed cautiously and under close review.

Infection (uncommon)

Treated skin can look alarming without being infected. Seek review promptly if you have rapidly spreading redness, increasing pain or warmth, pus, or fevers / feeling unwell.

Who should not use Aldara (imiquimod)?

Generally avoid or use only under specialist guidance in:

  • pregnancy
  • breastfeeding (limited data — caution)
  • immunosuppression (may be less effective; planning differs)

Always tell your doctor about medical history and medications.

When to contact your doctor urgently

Stop and seek medical advice if you develop:

  • severe pain, extensive ulceration, or rapidly worsening swelling
  • fever, rigors or feeling systemically unwell
  • signs of spreading infection
  • eye involvement (especially eyelid swelling with visual symptoms)

Alternatives

Depending on diagnosis and site, alternatives may include:

What to expect

  1. Consultation and diagnosis

    Clinical examination and dermoscopy, with biopsy where appropriate. We confirm the lesion is thin and superficial enough for Aldara (imiquimod) and rule out higher-risk subtypes that need surgery.

  2. Written treatment plan

    A common regimen for selected superficial skin cancers is Aldara (imiquimod) once daily, 5 days per week, for 6 weeks. You receive a written plan with area to treat, dose, and what to expect at each phase.

  3. At-home application

    Apply Aldara (imiquimod) 2–3 hours before bed so it can absorb without rubbing onto bedding. Wash with warm water, pat dry, wait 10–15 minutes, then apply a thin film to the lesion plus the margin advised (often around 5 mm). Avoid eyes, nostrils, lips and other mucous membranes.

  4. Managing the reaction

    Expect mild redness in weeks 1–2, building to peak inflammation in weeks 3–6 (redness, crusting, soreness, sometimes weeping). Do not occlude the area. Moisturiser, sunscreen and makeup are usually fine after about 20 minutes.

  5. Review and surveillance

    We review the area after the course, usually with dermoscopy, to check response and decide if further treatment or biopsy is required.

Results timeline

  • Week 1–2 Mild redness and itching may begin.
  • Week 3–6 Inflammation peaks — redness, crusting, soreness. Some areas (eg. side of nose) may swell dramatically.
  • After finishing The area gradually settles over weeks; appearance continues to improve.
  • Reassessment Clinical and dermoscopic review after the course. Biopsy if there is any doubt about clearance.

Ideal candidate

  • Patients with biopsy-confirmed superficial basal cell carcinoma (sBCC) suitable for non-surgical treatment.
  • Patients with biopsy-confirmed SCC in situ (Bowen's disease / intraepidermal carcinoma).
  • Selected patients with actinic keratosis (AK) where Aldara (imiquimod) is preferred over Efudix (5-fluorouracil).
  • Patients who want to avoid (or delay) surgery where appropriate.
  • Patients who can tolerate visible inflammation and several weeks of cosmetic downtime.
  • Patients who are not pregnant and are otherwise immunocompetent (immunosuppression requires specialist planning).

Frequently asked questions

  • How long does Aldara (imiquimod) take to work?
    Most people notice increasing redness and irritation over the first 2–4 weeks, with the peak reaction often during weeks 3–6. Healing can continue for several weeks after you stop.
  • Is a strong reaction a good sign?
    A visible inflammatory response is often expected and correlates with response, but "stronger" isn't always "better" — excessive ulceration or severe pain can increase complication risk. Contact your treating doctor if you're worried.
  • Can I wear sunscreen or makeup with Aldara (imiquimod)?
    Usually yes once the product has absorbed (after about 20 minutes). Choose non-irritating products. Sun protection is important during and after treatment.
  • Can I cover the area with a dressing?
    Not usually. Occlusive dressings can intensify the reaction. Light, non-occlusive dressings may be acceptable — discuss with your doctor first.
  • Will Aldara (imiquimod) leave a scar?
    Most people do not scar, but scarring can occur. Discuss alternatives like LA-PDT or surgery if scarring is a major concern.
  • Is Aldara (imiquimod) safe in pregnancy or breastfeeding?
    Aldara (imiquimod) is generally avoided in pregnancy; caution in breastfeeding. Always tell your doctor.
  • How do you confirm the cancer is gone after treatment?
    Reassessment clinically and with dermoscopy after the course; biopsy if any doubt or recurrence.

References

  1. Schön MP, Schön M. Imiquimod — mode of action. Br J Dermatol (2007).
  2. Geisse J, et al. Imiquimod 5% cream for the treatment of superficial basal cell carcinoma — results from two phase III, randomized, vehicle-controlled studies. J Am Acad Dermatol (2004). Histologic clearance ~82% with the 5-times-weekly regimen.
  3. Jansen MHE, et al. Five-year results of a randomized controlled trial comparing photodynamic therapy, topical imiquimod and topical 5-fluorouracil for superficial basal cell carcinoma. J Invest Dermatol (2018). Five-year tumour-free survival for imiquimod 80.5%.
  4. Patel GK, et al. Imiquimod 5% cream monotherapy for cutaneous squamous cell carcinoma in situ (Bowen's disease) — a randomized, double-blind, placebo-controlled trial. J Am Acad Dermatol (2006). 73% cleared with no relapse at 9 months.
  5. Thomson J, et al. Interventions for basal cell carcinoma of the skin. Cochrane Database of Systematic Reviews (2020). Surgical excision 5-year recurrence ~2.3% (about 97% clearance).
  6. Jansen MHE, et al. Randomized trial of four treatment approaches for actinic keratosis. N Engl J Med (2019). At 12 months, 5-fluorouracil cleared AK more effectively (74.7%) than imiquimod (53.9%).

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