MSD Manual

Please confirm that you are not located inside the Russian Federation

honeypot link

Keratoacanthomas

By

Gregory L. Wells

, MD, Ada West Dermatology and Dermatopathology

Last full review/revision Jan 2021| Content last modified Jan 2021
CLICK HERE FOR THE PROFESSONAL VERSION
Topic Resources

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.

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 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:

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.

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.

NOTE: This is the Consumer Version. DOCTORS: CLICK HERE FOR THE PROFESSONAL VERSION
CLICK HERE FOR THE PROFESSONAL VERSION
Others also read
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Test your knowledge
Atopic Dermatitis (Eczema)
Atopic dermatitis, commonly known as eczema, is a chronic condition that causes itchy inflammation of the upper layers of skin. Eczema is especially common in people who have hay fever or asthma, and in people whose family members have these conditions. Eczema is common, particularly in urban areas and developed countries. What percentage of children and adolescents are affected by eczema?  
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Also of Interest

Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
TOP