Sebaceous

Trichilemmal Cyst

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Trichilemmal Cyst, Scalp Cyst, Pilar Cyst, Wen

  • Epidemiology
  1. Most common in over age 15 years
  • Pathophysiology
  1. Epidermal Cyst involving the scalp in 90% of cases
  2. Most common in areas of dense Hair Follicles
  • Symptoms
  1. Asymptomatic in most cases
  2. No odor (unlike Epidermal Cysts)
  • Signs
  1. Well defined, scalp oval mass
  2. Scalp Cysts collect keratin of cheese consistency
  3. Multiple Scalp Cysts may coalesce
  4. May become inflamed if rupture occurs
  5. Often associated with overlying regions of Alopecia
  • Management
  • Excision
  1. Complete excision in standard fashion
  2. See Minimal Epidermal Cyst Excision
  • References
  1. Habif (1996) Clinical Dermatology, p. 644-5