Actinic Keratosis: What Those Rough Patches Mean and How They Are Treated

You notice a rough, dry spot on your forearm, scalp, or the back of your hand. It feels like sandpaper, it may flake, and it does not go away with moisturizer. It might be actinic keratosis, one of the most common reasons adults see a dermatologist.

Here is what that means, how worried to be, and what actually treats it.

What actinic keratosis is

Actinic keratosis (AK) is a rough, scaly patch that forms on skin with years of sun exposure. It is caused by cumulative ultraviolet damage, so it shows up on the face, ears, scalp, forearms, and hands. Patches can be skin-colored, pink, red, or brown. Some are easier to feel than to see.

AK is considered a precancerous skin change. It carries some risk of progressing to squamous cell carcinoma, a common type of skin cancer (Rosso et al., 2021). That sounds scary, so here is the honest context: most patches do not become cancer. The hard part is that we cannot reliably tell which ones will.

How concerned should you be

Experts agree the exact risk of any single patch turning into invasive cancer is poorly defined (Rosso et al., 2021). So we do not promise a number.

What we do know is which features deserve a closer look. A systematic review found that long-standing patches and patches that merge into larger rough areas were the types most linked to later squamous cell carcinoma (Balcere et al., 2022). That review rested on a small number of studies, so treat it as a guide, not a rule.

Get a patch checked soon if it:

• Grows quickly or becomes thick or raised
• Bleeds, crusts repeatedly, or turns into a sore that does not heal
• Becomes tender, painful, or itchy
• Looks different from your other patches

Why treat it at all

There are two reasons. First, treating a patch removes a spot that could progress. Second, AK is a sign that your skin has had a lot of sun damage, and new patches tend to appear over time. Treatment is as much about the whole area of skin as it is about one spot.

The tradeoff is real. Treatments take effort, can cause temporary redness or crusting, and sometimes need repeating. Experts note that treatment results depend on how well people can stick with the plan, so a treatment you will actually finish matters (Rosso et al., 2021).

Treatment options

The right choice depends on how many patches you have and where they are.

Freezing (cryotherapy). Liquid nitrogen is applied to a single patch. It is quick and widely used for isolated spots. It stings, and it can leave a blister, a scab, or a lighter patch of skin.

Creams for larger areas. When you have several patches close together, treating the whole area works better than chasing each spot. Topical options include fluorouracil and imiquimod. These usually cause redness, crusting, and soreness for a couple of weeks. That reaction is expected, and it is also why some people stop early. Tell us if it feels like too much, because dosing and schedules can be adjusted.

Photodynamic therapy. A light-sensitizing medicine is applied to the skin and then activated by light, done by a dermatology specialist. A 2026 meta-analysis of six randomized trials found photodynamic therapy cleared lesions better than imiquimod cream and caused fewer problems like ulceration and crusting (Tian et al., 2026). The number of trials was small, so the finding is encouraging rather than final.

Combining approaches. A meta-analysis of nine trials found that freezing plus a topical treatment cleared more patients completely than freezing alone, with similar tolerability (Heppt et al., 2018). Other combinations, such as calcipotriol with fluorouracil, are being studied, but the evidence is still limited and does not yet show they beat fluorouracil alone (Mohney et al., 2022).

What to do between visits

You cannot undo past sun exposure, but you can slow new damage:

• Use broad-spectrum sunscreen on exposed skin every day
• Wear a hat and sun-protective clothing outdoors
• Avoid tanning beds
• Check your skin monthly, including your scalp, ears, and the backs of your hands, and take photos so you can see change over time

Photos also make a telehealth visit far more useful. Take them in good light, one close up and one from a few feet away.

When a patch is more than a patch

Sometimes a rough spot is not actinic keratosis at all. Eczema, psoriasis, and a wart can all look similar, and a slow-growing skin cancer can hide in a patch that seems harmless. That is why we do not guess from a description alone.

If a patch looks unusual, we say so plainly and arrange a biopsy through a local specialist. A biopsy is the only way to be sure what a patch is made of. It is a small, quick procedure, and getting an answer is usually a relief compared with waiting and wondering. For a broader look at warning signs, see our guide to skin cancer screening.

How we help

We review your photos and history by video, sort out which patches look routine and which need a closer look, and build a plan that fits your skin and your schedule. If you need a biopsy or freezing, we refer you to a local specialist and coordinate the follow-up.

If you have a rough patch that will not go away, or you simply want a plan for sun-damaged skin, start with a visit. Learn more about dermatology care at Stonewood. Most major plans are accepted, including Medicare.