Does topical 5-fluorouracil treat Bowen's disease?

Bowen's disease is an early form of abnormal squamous cell growth confined to the outer skin layer. Topical 5-fluorouracil can act on abnormal cells across a superficial treatment area. The skin may become red, sore, scaly, or crusted during the course, reflecting the medicine’s local action.

Not every lesion is appropriate for cream treatment. A dermatologist considers the diagnosis, thickness, size, site, borders, and whether the lesion has features suggesting deeper involvement. A biopsy or another treatment may be recommended when the appearance is uncertain or the lesion is not superficial enough for this approach.

Use the prescribed schedule and apply the medicine only to the marked area. Wash your hands after use, protect the site from sunlight, and avoid covering it with an unapproved dressing. Do not pick crusts or add steroid, antiseptic, or cosmetic products without asking the treating clinician.

The [Topical 5-Fluorouracil](/treatments/medical-dermatology/topical-5-fluorouracil/) page gives general treatment information. Keep every review appointment because the treated site needs examination after the surface reaction has settled.

Contact your dermatologist if the reaction becomes difficult to tolerate, spreads outside the planned area, or causes significant cracking, swelling, or discharge. Seek prompt assessment for increasing thickness, persistent ulceration, bleeding, a new lump, or pain that continues after the expected healing period. These changes need direct review.

Has the diagnosis been confirmed, and is this lesion superficial enough for cream treatment? What skin reaction should I expect and how should I care for it? What should I do if the area cracks, bleeds, or becomes very sore? How will you confirm that the lesion has responded?