Seborrheic keratosis is a type of skin growth. Although they can be unsightly and may cause embarrassment, the growths are not harmful. However, in some cases seborrheic keratosis can be difficult to distinguish from melanoma, a very serious type of skin cancer. If your skin changes unexpectedly, you should always have it looked at by a doctor.
Seborrheic keratosis is usually easily identified by appearance.
There is usually more than one growth. Growths can be found on many areas of the body, including the:
Growths are not found on the soles of the feet or the palms.
Growths often start out as small, rough areas. Over time, they tend to develop a thick, wart-like surface.
They may also have a waxy appearance and slightly raised surfaces.
Growths are usually round or oval shaped.
Growths are usually brown. However they can also be yellow, white, or black.
Risk factors for this condition include:
According to the U.S. National Library of Medicine, the condition often develops in individuals over the age of 40 (NLM, 2010). Risk increases with age.
Family Members with Seborrheic Keratosis
The skin condition often runs in families. Risk increases with the number of affected relatives.
Frequent Sun Exposure
According to the American Academy of Dermatology, there is some evidence that skin exposed to the sun is more likely to develop seborrheic keratosis. However, more research must be done. Growths also appear on skin that is usually covered up when people go outdoors (AAD).
Seborrheic keratosis is not dangerous. However, you should not ignore growths on your skin. It can be difficult for the average person to distinguish between harmless and dangerous growths. Something that looks like this condition could actually be melanoma.
Arrange for a doctor to check your skin if:
- there is a new growth
- there is a change in appearance of an existing growth
- there is only one growth (seborrheic keratosis usually causes several)
- a growth has an unusual color
- a growth has borders that are irregular
- a growth is irritated and/or painful
If you are worried about any growth, make an appointment with your doctor. It is better to be too cautious than potentially ignore a serious problem.
A dermatologist will often be able to diagnose seborrheic keratosis by eye. However, if there is any uncertainty, part or all of the growth will be removed. This is called a biopsy.
The biopsy will be examined under a microscope. This can distinguish between seborrheic keratosis and cancer.
In many cases, seborrheic keratosis does not need treatment. However, a doctor may decide to remove one or more growths if they have a suspicious appearance. They may also be removed if they are causing physical or emotional discomfort.
Methods of Removal
According to the American Academy of Dermatology, two commonly used removal methods are cryosurgery and electrosurgery/curettage (AAD).
With cryosurgery, the growth is frozen off using liquid nitrogen.
Electrosurgery uses an electrical current to scrape the growth off. The area is numbed before the procedure.
Your skin may be lighter at the site of removal. However, growths will not typically reappear in the same location. The difference in skin color often becomes less noticeable over time.