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What are seborrheic keratoses?
Seborrheic keratoses (say "seh-buh-REE-ick kair-uh-TOH-seez") are skin growths that some people get as they age. They are benign, which means they aren't a type of cancer. The way they look may bother you, but they aren't harmful.
These skin growths often appear on the back or chest, but they can occur on any part of the body. They grow slowly and seldom go away on their own.
These skin growths are common in middle-aged and older people, but they can appear as early as the teen years. Some women get them during pregnancy or after taking estrogen. Children seldom have them.
What causes seborrheic keratoses?
Experts don't know what causes seborrheic keratoses. But research has found that:1
- They tend to run in families.
- They seem to be related to sun exposure.
What are the symptoms?
Seborrheic keratoses can itch, bleed easily, or become red and irritated when clothing rubs them.
How the growths look can vary widely. They:
- Range in size from tiny to larger than 1 in. (3 cm) in diameter.
- Range in texture from waxy and smooth to velvety to dry, rough, and bumpy.
- Range in color from white to light tan to black. Most are brown. Some are multicolored.
- May have dry scale, which you can easily pick off, or have a surface that crumbles when picked.
- Can be dome-shaped with tiny white or black "horns" growing from the surface.
- Can occur as a single growth or a cluster of growths.
- Can look like skin tags (small, soft pieces of skin that stick out on a thin stem).
- Can swell and turn red.
How are seborrheic keratoses diagnosed?
Your doctor will look at the skin growth. He or she may need to take a sample (biopsy) of the growth if it's not clear what the growth is or if it:
- Itches or bleeds.
- Becomes inflamed and red.
- Is dark brown to black.
How are they treated?
Seborrheic keratoses don't need to be treated. But if one bothers you or you don't like how it looks, your doctor can remove it. Your doctor may:
- Freeze it off (cryotherapy).
- Cut it out (curettage or excision).
- Use a tool that burns it off (electrocautery or laser treatment).
Should you worry about seborrheic keratoses?
A diagnosed seborrheic keratosis is nothing to worry about. But if you are unsure what type of skin growth you have, see your doctor. It may be hard to tell whether the growth is a keratosis, a mole, a wart, or skin cancer.
Frequently Asked Questions
Learning about seborrheic keratoses:
Other Places To Get Help
|American Academy of Dermatology|
|P.O. Box 4014|
|Schaumburg, IL 60168|
|Phone:||1-866-503-SKIN (1-866-503-7546) toll-free|
The American Academy of Dermatology provides information about the care of skin, hair, and nails. You can locate a dermatologist in your area by using their "Find a Dermatologist" tool at www.aad.org/find-a-derm.
- Thomas VC, et al. (2008). Seborrheic keratosis section of benign epithelial tumors, hamartomas, and hyperplasias. In K Wolff et al., eds., Fitzpatrick's Dermatology in General Medicine, 7th ed., vol. 1, pp. 1054–1056. New York: McGraw-Hill Medical.
Other Works Consulted
- Hall JC (2010). Seborrheic keratoses section of Tumors of the skin. In JC Hall, ed., Sauer's Manual of Skin Diseases, 9th ed., pp. 280–284. Philadelphia: Lippincott Williams and Wilkins.
- Motley RJ (2010). Seborrheic keratosis. In MG Lebwohl et al., eds., Treatment of Skin Disease, 3rd ed., pp. 697–698. Edinburgh: Saunders Elsevier.
|Primary Medical Reviewer||Kathleen Romito, MD - Family Medicine|
|Primary Medical Reviewer||Adam Husney, MD - Family Medicine|
|Specialist Medical Reviewer||Randall D. Burr, MD - Dermatology|
|Last Revised||August 5, 2011|
Last Revised: August 5, 2011
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