Skin Cancer Cream Guide
General information only — not medical advice. Always follow the specific instructions from your own GP or dermatologist. Dosing schedules, treatment areas, and duration vary between patients.
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Skin Cancer Cream — Tips & What to Expect
A practical guide for people using Efudix (5-fluorouracil) or Aldara (imiquimod) for solar keratoses or skin cancer in Australia. The reaction can look alarming — here is what is normal.
🇦🇺 Australia
NPS MedicineWise
TGA approved
The two most common creams
Efudix
5-fluorouracil 5% cream
• Solar keratoses (AK)
• Some superficial BCCs
• Usually 2–4 weeks
• Typically applied twice daily
Often more intense reaction
Aldara
Imiquimod 5% cream
• Superficial BCC
• Solar keratoses (AK)
• Usually 6–16 weeks
• Applied less frequently
Generally milder reaction
Your GP prescribed one of these for a specific reason. Do not swap between them or adjust the schedule without checking first. There is also a third cream — Solaraze (diclofenac 3% gel) — used for solar keratoses with a milder reaction profile.
🔥 The reaction IS the treatment working
The most common reason these treatments fail is that people stop early because the reaction looks alarming. Redness, crusting, peeling, weeping and soreness are expected and normal — this is the cream doing exactly what it is supposed to do.
With Efudix, the reaction typically peaks around weeks 2–3 and then settles. At its peak the skin can crack, crust and weep — this is called the erosion stage. The length of the course is set by your prescriber, so if your skin reaches this stage, contact your GP about whether to stop rather than deciding alone. The skin may look like a sunburn or worse before it heals. With Aldara, the reaction builds more gradually over the treatment course.
The skin healing after the reaction is also part of the process. Treated areas may look pink and raw before the new healthy skin comes through. This takes a few weeks after finishing.
💡 Practical tips — how to use it well
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Apply a thin layer. Less is more — a thin smear over the area is enough. Thicker application increases reaction intensity without improving results.
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Use a glove or cotton bud. Wear a glove or use a cotton bud to apply, especially on the face. Wash hands thoroughly before and after if not using a glove — getting these creams in your eyes or mouth is painful.
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Apply at night. Applying before bed reduces the chance of sun exposure on freshly treated skin and means you sleep through the peak absorption period. For Aldara, wash off after the number of hours your GP specified (usually 6–8 hours).
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Strict sun protection. These creams make treated skin significantly more sensitive to UV. Use SPF 50+ daily on the treatment area, wear a hat, and avoid direct sun as much as possible — during treatment and for 4–6 weeks afterwards.
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Gentle moisturiser is fine. A plain, fragrance-free moisturiser on surrounding skin can help with dryness and discomfort. Do not apply moisturiser directly over the cream or immediately before applying it.
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Stick to the schedule. If your GP said twice daily, that means morning and night. Missing doses reduces effectiveness. Consistency matters more than intensity of reaction.
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Avoid eyes, nostrils, mouth, and broken skin. These creams are for intact skin only. The reaction near mucosal areas can be severe. If treating near the eye, ask your GP about how much clearance to leave.
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Gentle cleansing only. Use lukewarm water and a mild soap-free wash on the treated area. Avoid scrubbing, exfoliating, or picking at crusting — let the skin do its thing.
Managing the reaction — comfort tips
Soreness and discomfort are common. Over-the-counter paracetamol or ibuprofen can help. A cool (not cold) damp cloth held gently against the area can ease the burning sensation.
If your GP approves, a short-term break of a few days may be appropriate if the reaction is particularly uncomfortable — but always check before pausing, as unplanned breaks can affect outcomes.
Avoid using other active skincare products (retinoids, exfoliants, AHAs, vitamin C serums) on or near the treated area during treatment.
📞 When to contact your GP
Contact your GP if you experience:
❌ Signs of infection — increasing warmth, swelling, pus, or spreading redness beyond the treatment area
❌ Severe pain that is not manageable with paracetamol/ibuprofen
❌ Flu-like symptoms (fever, chills, fatigue) — more common with Aldara
❌ The treated area is not healing after finishing the course
❌ A new or changing lesion appears in or near the treatment area
❌ Any reaction that concerns or worries you
If you are unsure whether your reaction is within the expected range — contact your GP. It is always better to check than to stop treatment prematurely or continue through something that needs attention.
After you finish the course
Your GP will usually arrange a review appointment 4–8 weeks after completing treatment to check the area under dermoscopy and confirm the lesions have cleared. Keep this appointment even if the skin looks healed.
Some redness or sensitivity in the treated area can persist for weeks after finishing. This is normal. Continue sun protection throughout.
Annual skin checks are important for anyone who has had solar keratoses or skin cancer — once you have had one, your risk of developing more is higher. Talk to your GP about how often to have skin checks.