(See also Overview of Skin Cancer.)
Keratoacanthomas appear most commonly on sun-exposed areas, the face, forearms, and back of the hands and grow quickly. In 1 or 2 months, they typically grow into lumps about 1 inch (about 2.5 centimeters) wide, but sometimes they grow over twice as large. They may spontaneously disappear within a few months, often leaving a scar.
The cause of keratoacanthomas is unknown. Most doctors consider keratoacanthomas to be a form of squamous cell carcinoma, a type of skin cancer.
Diagnosis of Keratoacanthomas
To confirm the diagnosis of keratoacanthoma, doctors often do a biopsy, in which a piece of skin is removed and examined under a microscope. Sometimes they completely remove the tumor during the biopsy.
Prevention of Keratoacanthomas
Because keratoacanthomas can be caused by exposure to sun, people can help prevent this cancer by doing the following:
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Avoiding the sun: For example, seeking shade, minimizing outdoor activities between 10 AM and 4 PM (when the sun’s rays are strongest), and avoiding sunbathing and the use of tanning beds
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Wearing protective clothing: For example, long-sleeved shirts, pants, and broad-brimmed hats
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Using sunscreen: At least sun protection factor (SPF) 30 with UVA and UVB protection used as directed and reapplied every 2 hours and after swimming or sweating but not used to prolong sun exposure
Treatment of Keratoacanthomas
More Information
The following is an English-language resource that may be useful. Please note that THE MANUAL is not responsible for the content of this resource.
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American Cancer Society: What Are Basal and Squamous Cell Skin Cancers? Information about squamous cell carcinoma, including treatment options and prognosis
