5-FLUOROURACIL (EFUDIX)
This is a cream treatment that can be used to treat precancerous lesions such as squamous cell carcinoma in-situ (actinic keratosis and Bowen’s disease). Under certain circumstances, a specific skin cancer called superficial basal cell carcinoma may be treated with this cream also.
Essentially this is chemotherapeutic in a cream formulation. The chemotherapy agent kills the cancerous cells in the skin selectively while leaving normal skin intact. This leads to redness and crusting of the skin, which is the normal response to this treatment.
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https://www.dermnetnz.org/