Aldara is suitable for superficial Basal Bell Carcinomas and Aktinic Keratoses. Aldara stimulates the immune system to destroy cancerous and pre-cancerous cells. It is applied nightly for two to six weeks. Aldara can treat subclinical lesions, as well as the more obvious actinic keratosis. It’s generally well tolerated when used twice weekly. Redness and ulcerations may occur with treatment.