Differences between sebaceous hyperplasia and flat warts

The main differences between milia and flat warts are as follows: 1. **Etiology**: Milia, medically known as epidermoid cysts, are typically caused by abnormal lipid metabolism, cosmetic irritation, or the skin's self-repair process following damage. They are small white cysts and non-contagious. In contrast, flat warts are caused by infection with human papillomavirus (HPV), are contagious, and can spread through direct contact. 2. **Appearance**: Milia usually appear as small yellowish or white granules, approximately 1–2 mm in diameter, commonly found around the eyes and on the cheeks. Flat warts present as flat, round or oval-shaped papules, which may be dark brown, flesh-colored, or light brown. Their size varies—they can be as small as a pinhead or grow and coalesce into patches up to about 1 cm in diameter. They commonly occur on exposed areas such as the face, neck, and arms. 3. **Treatment**: Milia generally do not require specific treatment and may resolve spontaneously, though they can be removed using laser therapy or surgery. Flat warts require comprehensive treatment based on the individual condition, including medication and physical therapies, and care should be taken to avoid transmission.