Facial dermoid cyst

A facial dermoid cyst is a benign congenital developmental cyst that occurs on the face, most commonly near the eyebrows (particularly at the lateral brow near the frontzygomatic suture), the nasal bridge, or along embryonic fusion lines. These cysts arise from ectodermal tissue that becomes trapped beneath the skin surface during embryonic development when facial processes fuse together. They are lined by keratinized stratified squamous epithelium and may contain skin appendages such as hair follicles, sebaceous glands, and sweat glands, along with keratin, hair, and sometimes fatty material. Facial dermoid cysts typically present at birth or during early childhood as a firm, non-tender, subcutaneous nodule that is usually painless and slow-growing. The most common location is the lateral eyebrow region, but they can also occur at the nasal root, midline of the nose, or other facial sites along embryonic fusion lines. While most are superficial, some dermoid cysts — particularly those located at the nasal bridge or midline — may extend deeper through bone and potentially communicate with intracranial structures, which necessitates imaging (CT or MRI) prior to surgical intervention to evaluate the full extent of the lesion. The primary treatment for facial dermoid cysts is complete surgical excision, which is both diagnostic and curative. Surgery is generally recommended to prevent complications such as infection, rupture (which can cause an inflammatory reaction), or progressive enlargement that may lead to cosmetic deformity or pressure effects on surrounding structures including the orbit. Incomplete excision may result in recurrence. The prognosis following complete surgical removal is excellent, with low recurrence rates. Facial dermoid cysts are not associated with malignant transformation.

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