I have completed brachytherapy, chemo therapy (cisplatin) and external radiation therapy - two weeks since the last external radiation treatment, 3 weeks since the last internal (brachy) radiation treatment and 3 weeks since the last chemotherapy treatment. The side effects of the radiation treatments are diarrhea. I have several hemorrhoids that have developed and are quite uncomfortable. I currently use topical lido-cane, and prep H products, however, I have had better luck with dermoplast in the past. The research nurse thought there was a carcinogenic in dermoplast and did not authorize its use. what is the carcinogen ?