A pilonidal cyst is a pocket of hair, skin and oils, that can be above your child's buttocks or on either side of the buttock cleft. A pilonidal cyst looks like a large pimple or bump.

Symptoms of a pilonidal cyst may include:

  • Sometimes simple swelling just above your buttocks
  • Pain and swelling (if the cyst becomes inflamed or infected)
  • Hair coming out of the cyst
  • Pus or blood draining from an opening in the skin
  • Bad smell from the cyst
  • Tenderness around the cyst
  • Fever (not often)

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