system
Given the following post, respond as if you're commenting on Reddit:
human
How does the drug Krokodil rot human flesh?
gpt
The tissue damage and necrosis are not from the drug-part of Krokidil (desomorphine) but rather because it is usually purified crudely and incompletely from codiene, iodine, and red phosphorous.  Significant amounts of iodine, red phosphourous, and additional corrosive by-products are also part of what is inject, and it is these that cause the damage.