DefinitionA cyst is a closed pocket or pouch of tissue. It can be filled with air, fluid, pus, or other material. ConsiderationsCysts may form within any tissue in the body. Most cysts in the lungs are filled with air. Cysts that form in the lymph system or kidneys are fluid-filled. Certain parasites, such as some types of roundworms and tapeworms, can form cysts within the muscles, liver, brain, lungs, and eyes. Cysts are common on the skin. They can develop when acne causes a sebaceous gland to clog, or they can form around something that is stuck in the skin. These cysts are not cancer (benign), but can cause pain and changes in appearance. At times, they can become infected and need treatment due to pain and swelling. Cysts can be drained or removed with surgery, depending on their type and location. Sometimes, a cyst looks like a skin cancer and may need to be removed to be tested. A pilonidal dimple or cyst is a type of skin cyst at the top of the buttocks in the midline of the body. ReferencesDinulos JGH. Principles of diagnosis and anatomy. In: Dinulos JGH, ed. Habif's Clinical Dermatology: A Color Guide in Diagnosis and Therapy. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 1. Fairley JK, King CH. Tapeworms (cestodes). In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 289. James WD, Elston DM, Treat JR, Rosenbach MA, Neuhaus IM. Epidermal nevi, neoplasms, and cysts. In: James WD, Elston DM, Treat JR, Rosenbach, MA, Neuhaus IM, eds. Andrews' Diseases of the Skin: Clinical Dermatology. 13th ed. Philadelphia, PA: Elsevier; 2020:chap 29. | |
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Review Date: 10/20/2022 Reviewed By: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited. | |
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