A cyst on the lower back above the buttocks is commonly identified as a pilonidal cyst. This is an unusual pocket that forms in the skin, almost always located near the tailbone at the very top of the buttocks.
Understanding Pilonidal Cysts
A pilonidal cyst is essentially a small, abnormal sac or pocket within the skin. While it can remain asymptomatic, it sometimes becomes infected, leading to pain, redness, and swelling.
Key Characteristics
Pilonidal cysts have distinct features that help define them:
- Location: Primarily found near the coccyx (tailbone) in the crease of the buttocks.
- Contents: These cysts typically contain an accumulation of hair and skin debris.
- Appearance: They can range from a small dimple to a large, painful mass if infected.
| Characteristic | Description |
|---|---|
| Type of Cyst | Pilonidal Cyst |
| Common Location | Near the tailbone, at the very top of the buttocks, in the gluteal crease. |
| Typical Contents | Hair, skin debris, and sometimes fluid if infected. |
| Primary Cause | Ingrown hairs piercing the skin. |
How They Form
The formation of a pilonidal cyst typically begins when loose hairs puncture the skin. Once these hairs become embedded, the body's immune system may react to them as foreign objects, forming a cyst around them. This can also occur due to friction or pressure that forces hair into the skin, such as prolonged sitting or tight clothing.
For more detailed information on skin cysts and related conditions, you can consult reputable health resources like the Mayo Clinic or WebMD.
