Actinic keratoses (AKs) don’t necessarily appear in isolated spots. Instead, they often develop across a broader area of sun-damaged skin—what dermatologists call a “field.” That’s why treatment for AKs tends to involve field therapy, which targets both visible and invisible precancerous cells.
At Medovate Dermatology, several effective field therapy options can help treat AKs and guard against skin cancer. Here’s how they compare.
5-Fluorouracil (5-FU)
5-FU is a topical chemotherapy cream that treats AKs by destroying abnormal cells. It’s applied by the patient at home, usually once or twice daily for 2 to 4 weeks.
What to expect:
- Redness, crusting, and irritation in treated areas
- Visible “light up” reaction, indicating the medication is working to eliminate AKs
- Other areas may also light up, indicating hidden lesions also responding to the treatment
- Gradual healing once treatment is complete
5-FU is often recommended for larger treatment areas and is one of the most effective ways to clear widespread sun damage.
Imiquimod
Imiquimod is also a prescription topical cream, but unlike 5-FU, it stimulates your immune system to recognize and eliminate abnormal cells. It’s applied by the patient at home, usually twice a week for 16 weeks.
What to expect:
- Redness, flaking, burning, and itching on the treated skin
- Sometimes mild flu-like symptoms as the immune system responds
- A slower, immune-driven response compared to 5-FU
- Treatment schedules can vary depending on the formulation
This option can be helpful for patients who prefer an immune-based approach rather than direct cell destruction.
Photodynamic Therapy (PDT)
PDT is an in-office treatment that combines a light-sensitizing solution with a special light source to destroy precancerous cells. A topical medicine is briefly applied, then a few hours later a blue light source is used to activate a chemical reaction that kills abnormal cells.
What to expect:
- Burning or stinging during treatment
- Visible “light up” reaction, indicating the medicine is working to eliminate AKs
- Redness and peeling afterward
PDT can be especially effective for use on the face and scalp and for treating multiple lesions.
Chemowraps
Chemowraps are an in-office extensive treatment used for heavily sun-damaged areas like the arms or legs. A thick coat of 5-FU cream is applied and then wrapped to enhance absorption. The chemowrap is removed in 5 to 7 days, after which the skin is gently scrubbed to eliminate loose skin and scabs. 5-FU cream is then applied once a week for up to 12 weeks.
What to expect:
- More intensive treatment for widespread AKs
- Close supervision by your dermatology team
- Intense (but temporary) inflammation in the treated area, including redness, peeling, crusting, and itching
- Stronger reaction in treated areas, sometimes requiring treatment cessation and application of petroleum jelly
This approach is reserved for patients with extensive or stubborn AKs.
Choosing the Right Treatment
The best field therapy for AKs depends on your skin, the extent of sun damage, your lifestyle, and how much downtime you can accommodate. Our dermatologists can help you evaluate your treatment options and determine the best choice for you.
If you’ve been diagnosed with actinic keratoses, call Medovate Dermatology at (847) 499-5500 to schedule a consultation. We’ll help you choose the most effective treatment plan to protect your skin and reduce your risk of skin cancer.