Most doctors think that ingrown hairs cause pilonidal cysts. Pilonidal means “nest of hair.” It is common to find hair follicles inside the cyst.
Another theory is that pilonidal cysts appear after trauma to that region of the body. During World War II, more than 80,000 soldiers developed pilonidal cysts that required a hospital stay. People thought the cysts were due to irritation from riding in bumpy Jeeps. For a while, the condition was actually called “Jeep disease.”
- Pain at the bottom of the spine
- Swelling at the bottom of the spine
- Redness at the bottom of the spine
- Draining pus
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