Trichofolliculoma

Histopathological Criteria

Microscopic Features (H&E)

The lesion is symmetric and highly organized within the superficial and deep dermis:

• Central ("mother") follicle: A large dilated cyst lined by stratified squamous epithelium with a granular layer (infundibular keratinization), filled with concentric keratin lamellae and many hair shaft fragments.
• Secondary ("daughter") follicles: Numerous secondary and tertiary follicles radiate outward from the wall of the central follicle like the spokes of a wheel. These contain hair matrix and papillae and may produce fine vellus hair shafts.
• Stroma: The tumor is enclosed by fibroblast-rich fibrous connective tissue, sharply separated from the surrounding normal dermis.

Imaging and Dermoscopy

• Dermoscopy:
  • Central pore / comedo-like opening: Opens onto the skin surface, yellow-brown or plugged with keratin.
  • Tufted hair sign / pin-cushion appearance: A cluster of fine white or pale hairs emerging from a single central opening, a highly specific clinical clue.
  • Vascular pattern: Crown vessels or fine branching vessels evenly distributed around the edge of the papule.
• High-frequency skin ultrasound (50 MHz): A well-defined hypoechoic mass in the superficial dermis with an anechoic center (the central follicle) and small internal hyperechoic dots (keratin plugs and hair shafts).

Clinical Presentation

• Typical sites: Mostly the face (especially the nose, cheeks, upper lip and chin), scalp and neck.
• Appearance: A small dome-shaped papule or nodule, 0.2–1.0 cm across, skin-colored or pale pink, with a smooth surface.
• Symptoms: Completely painless and non-itchy. Patients usually seek treatment for cosmetic reasons or because the small tuft of hair grows in an awkward spot on the face.

Treatment and Aesthetic Reconstruction at Haute-Derma

The goal of treating trichofolliculoma is to remove the base of the central follicle together with all secondary follicles to prevent recurrence, while keeping the scar as discreet as possible on cosmetically sensitive areas such as the nose and cheeks.

Morphological Assessment and Structural Mapping

• Dermoscopy: Looks for the tufted hair sign and central pore to confirm the diagnosis.
• High-frequency ultrasound (50 MHz): Precisely measures how deep the base of the central follicle extends (often down to the dermal–subcutaneous junction) to plan the right surgical depth.

Microsurgical Excision

Option 1: Punch excision — Preferred for Lesions < 4 mm

• Technique: A surgical punch matched to the edge of the papule (3–4 mm) is cut through the full thickness of the dermis to remove the central follicle and the entire network of secondary follicles.
• Advantage: The smallest possible wound, with minimal enlargement of the defect.

Option 2: Mini-elliptical excision — For Lesions > 4 mm

• Technique: An ellipse is drawn along the natural skin tension lines (Langer's lines) with a narrow 1 mm margin around the lesion, cutting through the base of the follicle into the subcutaneous fat.
• Note: We do not use shave excision alone, because any secondary follicle buds left in the deep dermis carry a very high risk of local recurrence.

Cosmetic Wound Closure and Recovery

• Subcuticular suture: Non-absorbable monofilament (nylon or polypropylene 7-0) is used to bring the wound edges together without tension.
• Adjuvant laser therapy: Sutures are removed after 5–7 days. After 2–4 weeks, fractional CO2 or pulsed dye laser (PDL) is used to fade scar redness and smooth the scar edges.