What ointment is used for treating filiform warts?

　　Treatment of filiform warts generally may include topical medications such as tretinoin cream, imiquimod cream, fluorouracil cream, salicylic acid ointment, and recombinant human interferon α2b gel. The choice should be based on the condition of the warts. Detailed explanations are as follows:

　　1. Tretinoin Cream: Works by regulating epidermal cell differentiation, promoting the shedding of abnormally proliferated wart tissue. Apply a small amount evenly on the surface of the wart once nightly. Initial use may cause local skin redness and dryness; after several weeks of continued use, the wart may gradually shrink.

　　2. Imiquimod Cream: An immune response modifier that activates the local skin immune system and enhances the clearance of the virus. Apply 2–3 times weekly,涂抹 at bedtime and wash off the next day. Suitable for cases with fewer warts, with relatively low irritation.

　　3. Fluorouracil Cream: Inhibits cell proliferation, damages the cellular structure of the warts, causing them to necrose and fall off. Apply directly to the wart 1–2 times daily. Care should be taken to avoid contact with surrounding healthy skin to prevent pigmentation or skin irritation.

　　4. Salicylic Acid Ointment: Functions to soften keratin and exfoliate the epidermis, gradually removing the superficial wart tissue. Choose an appropriate concentration based on the size of the wart and apply 1–2 times daily. Protect the surrounding skin during treatment to avoid excessive corrosion.

　　5. Recombinant Human Interferon α2b Gel: Possesses both antiviral and immune-modulating properties, inhibiting viral replication and enhancing local immune response. Apply 2–3 times daily, covering the entire wart. Often used as adjunctive therapy to reduce the likelihood of wart recurrence.

　　If no significant improvement is observed after a period of medication, or if the warts are large in size or numerous, timely medical consultation is recommended to consider physical treatments.