Chemotherapy creams are topical medications used to treat precancerous and some cancerous skin growths.  Additionally, they may also be used to treat certain viral infections of the skin, such as warts and molluscum.  5-Fluorouracil, Imiquimod, diclofenac sodium and ingenol mebutate are some of the most common topical chemotherapy creams prescribed by dermatologists.  Some degree of irritation and redness of the skin are caused by the medication as it treats the precancerous or cancerous skin growths.  Additionally, sun sensitivity may occur during treatment and appropriate sun protection is advised.