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As you get older, you may begin to notice rough, scaly spots appearing on your hands, arms, or face. These spots are called actinic keratoses, but they’re commonly known as sunspots or age spots.
Actinic keratoses usually develop in areas that’ve been damaged by years of sun exposure. They form when you have actinic keratosis (AK), which is a very common skin condition.
AK occurs when skin cells called keratinocytes start to grow abnormally, forming scaly, discolored spots. The skin patches can be any of these colors:
They tend to appear on the parts of the body that get the most sun exposure, including the following:
Actinic keratoses aren’t cancerous themselves. However, they can progress to squamous cell carcinoma (SCC), though the likelihood is low.
When they’re left untreated, up to 10 percent of actinic keratoses can progress to SCC. SCC is the second most common type of skin cancer. Due to this risk, the spots should be regularly monitored by your doctor or dermatologist. Here are some pictures of SCC and what changes to look out for.
AK is primarily caused by long-term exposure to sunlight. You have a higher risk of developing this condition if you:
Actinic keratoses start out as thick, scaly, crusty skin patches. These patches are usually about the size of a small pencil eraser. There might be itching or burning in the affected area.
Over time, the lesions can disappear, enlarge, remain the same, or develop into SCC. There’s no way of knowing which lesions may become cancerous. However, you should have your spots examined by a doctor promptly if you notice any of the following changes:
Don’t panic if there are cancerous changes. SCC is relatively easy to diagnose and treat in its early stages.
Your doctor may be able to diagnose AK simply by looking at it. They may want to take a skin biopsy of any lesions that look suspicious. A skin biopsy is the only foolproof way to tell if lesions have changed into SCC.
AK may be treated in the following ways:
Excision involves cutting the lesion from the skin. Your doctor may choose to remove extra tissue around or under the lesion if there are concerns about skin cancer. Depending on the size of the incision, stitches may or may not be needed.
In cauterization, the lesion is burned with an electric current. This kills the affected skin cells.
Cryotherapy, also called cryosurgery, is a type of treatment in which the lesion is sprayed with a cryosurgery solution, such as liquid nitrogen. This freezes the cells upon contact and kills them. The lesion will scab over and fall off within a few days after the procedure.
Certain topical treatments such as 5-fluorouracil (Carac, Efudex, Fluoroplex, Tolak) cause inflammation and destruction of the lesions. Other topical treatments include imiquimod (Aldara, Zyclara) and ingenol mebutate (Picato).
The best way to prevent AK is to reduce your exposure to sunlight. This will also help minimize your risk of skin cancer. Remember to do the following:
It’s also a good idea to examine your skin regularly. Look for the development of new skin growths or any changes in all existing:
Make sure to check for new skin growths or changes in these places:
Schedule an appointment with your doctor as soon as possible if you have any worrisome spots on your skin.
Written by: Janet Barwell and Elizabeth Boskey, PhD
Medically reviewed on: Sep 07, 2017: Justin Choi, MD
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