Epidermal Cyst
(Epidermoid Cyst; Epidermal Inclusion Cyst; Epithelial Cyst; Keratin Cyst)
Definition
An epidermal cyst is a lump under the skin. It has soft, yellow matter inside. They often happen on the face, neck, chest, upper back, genitals, or behind the ears.
Causes TOP
It may be caused by:
- Blockage of a hair follicle by skin cells due to a skin injury
- Damage to a hair follicle due to acne
Normal Skin AnatomyCopyright © Nucleus Medical Media, Inc. |
Symptoms TOP
Problems may be:
- Small, dome-shaped lump beneath the skin
- Foul-smelling, cheese-like material that may drain from the cyst
- Redness or pain on or around the cyst
Diagnosis TOP
You will be asked about your symptoms and health history. A physical exam will be done. This is often enough to make the diagnosis. You may be sent to a doctor who treats skin problems.
Treatment TOP
The cyst may go away on its own. It may need to be treated when it causes problems. This can be done with:
- Surgery to remove the entire cyst, including its contents and cyst wall
- Incision and drainage to remove the cyst contents, though it may return in time
Antibiotics may be given to treat infection.
RESOURCES:
American Academy of Dermatology
http://www.aad.org
Family Doctor–American Academy of Family Physicians
http://familydoctor.org
CANADIAN RESOURCES:
Canadian Dermatology Association
http://www.dermatology.ca
Health Canada
http://www.hc-sc.gc.ca
REFERENCES:
Common benign skin lesions. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/common-benign-skin-lesions. Updated February 5, 2018. Accessed November 25, 2019.
Cysts. DermNet NZ website. Available at:
...(Click grey area to select URL)
Updated February 2016. Accessed November 25, 2019.
Moreno-Ramírez D, Ruiz-Villaverde R, et al. A. process of care for patients with benign cysts and tumors: Consensus document of the Andalusian Regional Section of the Spanish Academy of Dermatology and Venereology (AEDV). Actas Dermosifiliogr. 2016 Jun;107(5):391-399.
Last reviewed September 2019 by
EBSCO Medical Review Board
James P. Cornell, MD
Last Updated: 7/28/2020