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Pigmented follicular cyst.

L Requena Caballero1, E Sánchez Yus

  • 1Hospital Clinico San Carlos, Universidad Complutense, Madrid.

Journal of the American Academy of Dermatology
|November 1, 1989
PubMed
Summary
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This study details a pigmented follicular cyst, a blue skin nodule clinically resembling a blue nevus. Histopathology revealed an epithelial cyst with keratin and pigmented hair shafts, distinct from eruptive vellus hair cysts.

Area of Science:

  • Dermatopathology
  • Histology
  • Clinical Dermatology

Background:

  • Pigmented follicular cysts are rare skin lesions.
  • Distinguishing these cysts from similar-appearing benign neoplasms is crucial for accurate diagnosis.

Observation:

  • A clinical presentation of a blue intracutaneous nodule mimicking a blue nevus.
  • Histopathologic examination revealed a mid-dermal epithelial cyst.

Findings:

  • The cyst wall exhibited stratified squamous epithelium with infundibular keratinization.
  • The cyst lumen contained laminated keratin and numerous pigmented terminal hair shafts.
  • This morphology differentiates it from other hair-containing epithelial cysts.

Implications:

Related Experiment Videos

  • Accurate histopathologic identification is key to differentiating pigmented follicular cysts from blue nevi.
  • Understanding the distinct features aids in the differential diagnosis of cutaneous cysts.
  • This case highlights the importance of detailed histopathological analysis in dermatological diagnosis.