Actinic keratoses can be effectively removed through several treatments, ranging from a quick freeze at your dermatologist’s office to prescription creams you apply at home over days or weeks. The right approach depends on how many spots you have, where they are, and how thick they’ve become. Most people need a combination of methods, especially if lesions keep appearing in the same sun-damaged areas.
Why Treatment Matters
Actinic keratoses are precancerous patches caused by cumulative UV damage. The risk of any single spot becoming squamous cell carcinoma is low, estimated at less than 0.1% per year per lesion. But for older adults with many spots, the annual progression rate climbs to around 0.6%, reaching roughly 2.5% within four years. Since there’s no reliable way to predict which specific lesion will progress, dermatologists treat all of them.
There’s also a broader issue at play. The skin surrounding a visible actinic keratosis has been hit by the same UV damage and often contains precancerous cells you can’t see yet. This concept, called field cancerization, is why dermatologists sometimes recommend treating an entire area of skin rather than just picking off individual spots.
Cryotherapy for Individual Spots
Freezing with liquid nitrogen is the most common first-line treatment for isolated actinic keratoses. Your dermatologist sprays liquid nitrogen directly onto the lesion for 5 to 20 seconds, forming an ice ball that destroys the abnormal cells. Thicker, scalier spots may need two freeze cycles or a longer application. The whole thing takes seconds per spot.
Afterward, you can expect redness, swelling, and sometimes a blister that crusts over and peels off within one to two weeks. Clearance rates for cryotherapy range from about 68% to 83% depending on how long and how many freeze cycles are used. Some lesions need a second treatment. If your lesion has a thick, crusty surface, your dermatologist may scrape it gently first or have you apply a keratolytic cream (typically containing urea or salicylic acid) for two weeks before freezing.
Cryotherapy works well when you have a handful of distinct spots. If you have dozens scattered across your scalp or face, freezing each one individually becomes impractical, and your dermatologist will likely recommend a field treatment instead.
Prescription Creams for Widespread Lesions
Topical treatments let you cover an entire area of sun-damaged skin, clearing both the visible spots and the precancerous cells hiding beneath normal-looking skin. These creams cause a controlled inflammatory reaction, so expect redness, irritation, and peeling during treatment. That reaction is the point: it means the medication is working.
Fluorouracil (5-FU)
Fluorouracil is a chemotherapy cream that kills rapidly dividing abnormal cells. The lower-strength version is applied once daily, while the higher-strength version is applied twice daily, both for two to four weeks depending on your response. Cure rates for topical fluorouracil exceed 90% in studies of widespread lesions, making it one of the most effective options available.
Nearly all patients experience facial irritation during treatment, though most describe it as mild to moderate. Your skin will become red, raw, and crusty in the treated areas. This peaks toward the end of treatment and resolves over the following two to four weeks. The temporary cosmetic disruption is significant enough that many people plan their treatment around social or work schedules. Fluorouracil can also be combined with a cryotherapy session for stubborn spots, with a short one-week course of the cream applied after freezing.
Imiquimod
Rather than directly killing cells, imiquimod activates your immune system to recognize and destroy precancerous tissue. It triggers an inflammatory response in the treated skin, drawing immune cells to the area to clear out abnormal growth. The typical schedule is three times per week for four to eight weeks, applied to the entire affected area. Some dermatologists use a cycle approach: four weeks of treatment followed by four weeks off, then a second cycle if spots remain. Beyond two cycles, additional benefit is minimal.
The skin reaction with imiquimod is similar to fluorouracil: redness, crusting, and soreness in treated areas. Many patients achieve complete or near-complete clearance with one or two treatment cycles.
Tirbanibulin
Tirbanibulin is a newer option with one major advantage: the treatment course is only five consecutive days. You apply it once daily to the affected area on your face or scalp, covering up to about the size of a credit card per application. In clinical trials, complete clearance at roughly two months after treatment was 44% to 54%, lower than fluorouracil but with a much shorter treatment period and less prolonged irritation. For people who can’t tolerate weeks of a raw, inflamed face, the five-day course is a meaningful trade-off.
Photodynamic Therapy for Field Treatment
Photodynamic therapy, or PDT, uses a light-sensitive chemical applied to the skin followed by exposure to a specific wavelength of light. The chemical accumulates preferentially in abnormal cells, and when activated by light, it destroys them from the inside. This makes PDT particularly good for treating large areas with many lesions, including ones not yet visible.
During the procedure, a cream is applied to your skin and left on for one to three hours (or sometimes overnight, depending on the formulation). Then the area is exposed to either blue or red light for several minutes. You’ll feel stinging or burning during the light exposure, and the treated skin becomes red and swollen afterward. Most protocols call for two treatment sessions.
Clearance rates are strong. Studies report complete response in 78% to 91% of treated lesions, depending on the specific protocol, number of sessions, and follow-up timeframe. PDT also tends to produce good cosmetic outcomes, since it targets abnormal cells while largely sparing healthy skin. The main downside is that your skin will be extremely sensitive to sunlight for 24 to 48 hours after treatment, so you’ll need to stay indoors or keep the area completely covered.
What Healing Looks Like
All field treatments, whether creams or PDT, cause some degree of redness, blistering, and discomfort. This isn’t a side effect to worry about; it’s the treatment doing its job. The inflammation flushes out damaged cells and triggers your skin to regenerate.
With topical creams like fluorouracil or imiquimod, the reaction builds gradually over days to weeks. Your skin in the treated area will turn red, then raw and crusty, often looking worse than you expected. Many people find this is the hardest part of treatment, not pain, but the appearance. The intensity typically peaks near the end of the treatment course and fades over the following two to four weeks as new, healthy skin replaces what was destroyed. After full healing, most people notice the treated area looks smoother and more even-toned than before, since the rough, scaly patches are gone.
Cryotherapy heals faster. Individual spots crust over and shed within one to two weeks, leaving behind pink skin that gradually returns to your normal tone over a few months. Temporary lightening of the skin at the treatment site is common, especially on darker skin tones.
Reducing New Lesions With Nicotinamide
Once you’ve cleared your existing actinic keratoses, preventing new ones from forming becomes the priority. Sun protection is the foundation: broad-spectrum sunscreen, hats, protective clothing, and avoiding peak UV hours. But there’s an additional tool with solid clinical evidence behind it.
A phase 3 trial published in the New England Journal of Medicine found that taking 500 mg of nicotinamide (a form of vitamin B3) twice daily reduced the number of new actinic keratoses by 11% to 20% over the course of a year compared to placebo. The effect was consistent across multiple time points: 11% fewer lesions at three months, peaking at 20% fewer at nine months, and 13% fewer at twelve months. Nicotinamide is inexpensive, available over the counter, and was well tolerated in the trial. It’s not a substitute for sun protection or treatment of existing spots, but it adds a measurable layer of prevention for people who keep developing new lesions.
Note that nicotinamide is not the same as niacin (nicotinic acid), which causes flushing at high doses. Look specifically for nicotinamide or niacinamide on the supplement label.