A garbage can with maggots smells but don’t think a few on a sanwich would...its the wiggling that warns you something is living in your sandwich...but they are using maggots, specially raised to debrid certain types of lesions that don’t heal, like with a diabetic and leg and foot lesions that won’t heal...maggots only eat dead skin and can help the healing process’s of some types of lesions....bandage get changed ever other day as when they are put on with a sterile dressing they are so small, like thread, but get fat quite quick on feeding on dead flesh....
OOPS its not just skin but dead flesh...sorry for the error