A cyst containing hair, usually found at the bottom of the spine near the buttocks.
Hair that has been encapsulated in a dermal cyst.
A cyst most often in the sacrococcygeal region, usually at the upper end of the intergluteal cleft. It is due to a developmental defect that permits epithelial tissue to be trapped below the skin or may be acquired. This type of cyst may become symptomatic in early adulthood when an infected draining sinus forms.