Aldara (imiquimod) is an immune response modifier. Aldara is used to treat actinic keratosis (a condition caused by too much sun exposure) on the face and scalp. Aldara (for the skin) is also used to treat a minor form of skin cancer called superficial basal cell carcinoma, when surgery would not be an appropriate treatment. Aldara also treats genital warts that appear on the outside of the body, but this medicine is not a cure for genital warts. Imiquimod may be used in adults and children who are at least 12 years.