For basal cell carcinoma, dermatologists usually recommend applying 5% fluorouracil cream in an amount sufficient to cover the lesions two times per day for three to six weeks. However ...

Fluorouracil interferes ... Keratoses: Apply twice daily until erosion occurs (usually 2–4 wks). Basal cell carcinoma (5% only): Apply twice daily, usually for 3–6 weeks (obliteration may ...