Pigmented follicular cysts

Area of Science:

• Dermatopathology
• Histology
• Skin Biology

Background:

• Epithelial cysts are common skin lesions.
• Accurate classification is crucial for diagnosis and treatment.
• Existing classifications may not encompass all observed cyst types.

Observation:

• Seven cases of a distinct epithelial cyst were analyzed.
• Clinically, lesions present as hyperpigmented.
• The cysts are situated in the mid-dermis.

Findings:

• Histological examination reveals epidermoid keratinization.
• Cysts contain laminated keratin and numerous pigmented hair shafts.
• The cyst wall features one to two active hair follicles, indicating a follicular origin.

Implications:

• This finding suggests a novel type of follicular cyst.
• Further research is needed to establish a definitive classification.
• Understanding this cyst's unique features aids in dermatological diagnosis.