Boils Slideshow Pictures

Medical Author:

Steven Doerr, MD

Steven Doerr, MD

Steven Doerr, MD, is a U.S. board-certified Emergency Medicine Physician. Dr. Doerr received his undergraduate degree in Spanish from the University of Colorado at Boulder. He graduated with his Medical Degree from the University Of Colorado Health Sciences Center in Denver, Colorado in 1998 and completed his residency training in Emergency Medicine from Denver Health Medical Center in Denver, Colorado in 2002, where he also served as Chief Resident.

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Medical Editor:

Melissa Conrad Stöppler, MD, Chief Medical Editor

Melissa Conrad Stöppler, MD, Chief Medical Editor

Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

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Pilonidal Cyst Causes

Although there are several theories, most researchers today believe that pilonidal cysts are acquired (rather than congenital, or inborn) and are caused by the penetration of loose hairs into the skin. In response to this ingrown hair, a local inflammatory reaction causes a cyst to form around the hair. Excessive pressure or repetitive trauma to the sacrococcygeal area are thought to predispose individuals to develop the cyst or to irritate an already existing pilonidal cyst.

During World War II, more than 80,000 soldiers developed pilonidal cysts requiring hospitalization. Because so many of the afflicted servicemen rode in bumpy Jeeps for prolonged periods of time, the condition was termed "Jeep disease."

In addition to male gender, other risk factors for the development of pilonidal cysts include a family history of pilonidal cysts, occupations which require prolonged sitting, hirsute (hairy or having copious hair) individuals, and the presence of a deep natal cleft (the cleft between the buttocks). Obese individuals are more likely to experience a recurrence of pilonidal cysts.