What Causes Flat Warts and Milia Around the Eyes?

Flat warts and milia are two distinct, benign skin conditions that commonly appear around the eyes—but they differ significantly in origin, appearance, and underlying pathology.

Flat warts (verruca plana) near the eyelids result from infection with certain low-risk strains of human papillomavirus (HPV), most commonly HPV types 3 and 10. These viruses infect keratinocytes in the epidermis, triggering hyperproliferation and abnormal differentiation. The periocular region is particularly susceptible due to frequent microtrauma—such as rubbing or scratching—and close proximity to other facial sites where HPV may be present. Unlike common warts, flat warts are typically smooth, flesh-colored or light brown, and measure 1–5 mm in diameter. They often occur in clusters and may persist for months to years without treatment.

Milia, by contrast, are keratin-filled cysts that arise from the pilosebaceous unit—not viral infection. Primary milia develop spontaneously when keratin becomes trapped beneath the surface of the skin, often due to immature or obstructed pilosebaceous ducts. Periocular milia are especially common in infants but also frequently affect adults, particularly following chronic sun exposure, topical corticosteroid use, or inflammatory skin conditions like rosacea or discoid lupus erythematosus. Secondary milia may form after epidermal injury—including laser resurfacing, chemical peels, or blistering disorders—where disrupted keratinocyte migration leads to cyst formation in the dermis or epidermis.

Accurate clinical differentiation is essential: flat warts demonstrate characteristic endophytic growth and may show faint surface scaling or subtle vascular patterns on dermatoscopy; milia appear as discrete, firm, pearly-white papules with no surrounding inflammation and do not resolve spontaneously in adults. Misdiagnosis can lead to inappropriate management—such as unnecessary antiviral therapy for milia or aggressive ablation for flat warts that might resolve spontaneously.