My parner has breast cancer and is going thru chemo. She keeps developing what starts out as a blister, then quickly deteriorates to a elongated, red, raw sore. We have tryed A&D ointment, neosporin, Aquasomething, powdr, etc. My pharmacist suggested putting peroxide on the site, letting it air dry and then applying Gold Bond powder. Do you have any suggestions. They appear in the crack of her buttock - they have shown anywheres from the rectum area on up to the latest, near the vagina.