Keratoacanthomas appear most commonly on sun-exposed areas, such as 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 Overview of Skin Cancer Skin cancer is the most common type of cancer, and people of all skin tones can be affected. People who have light skin are particularly susceptible to developing most forms of skin cancer because... read more .
Diagnosis of Keratoacanthomas
Biopsy
To confirm the diagnosis of keratoacanthoma, doctors often do a biopsy Biopsy Doctors can identify many skin disorders simply by looking at the skin. A full skin examination includes examination of the scalp, nails, and mucous membranes. Sometimes the doctor uses a hand-held... read more , in which a piece of skin is removed and examined under a microscope. Sometimes they completely remove the tumor during the biopsy.
Treatment of Keratoacanthomas
Surgery or injections of methotrexate or 5-fluorouracil
There is no guarantee that a keratoacanthoma will spontaneously disappear, and even when they do disappear, there is often a scar. Thus, keratoacanthomas are usually cut out or scraped (curetted) or injected with methotrexate or 5-fluorouracil.
Prevention of Keratoacanthomas
Because keratoacanthomas may be caused by exposure to sun, people can help prevent this cancer by doing the following, starting in early childhood:
Avoiding the sun Avoidance Sunburn results from a brief (acute) overexposure to ultraviolet (UV) light. Overexposure to ultraviolet light causes sunburn. Sunburn causes painful reddened skin and sometimes blisters, fever... read more : 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
Wearing protective clothing Clothing Sunburn results from a brief (acute) overexposure to ultraviolet (UV) light. Overexposure to ultraviolet light causes sunburn. Sunburn causes painful reddened skin and sometimes blisters, fever... read more : For example, long-sleeved shirts, pants, and broad-brimmed hats
Using sunscreen Sunscreens Sunburn results from a brief (acute) overexposure to ultraviolet (UV) light. Overexposure to ultraviolet light causes sunburn. Sunburn causes painful reddened skin and sometimes blisters, fever... read more : 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
More Information
The following English-language resource may be useful. Please note that THE MANUAL is not responsible for the content of this resource.
American Cancer Society: What Are Basal and Squamous Cell Skin Cancers? Information about squamous cell carcinoma, including treatment options and prognosis
Drugs Mentioned In This Article
Generic Name | Select Brand Names |
---|---|
methotrexate |
Jylamvo, Otrexup, Rasuvo, RediTrex, Rheumatrex, Trexall, Xatmep |
fluorouracil |
Adrucil, Carac, Efudex, Fluoroplex, Tolak |