Reminds me of Krokodil [1].
That said, I just finished listening to an episode of Radiolab [2] describing how unsubstantiated claims about fentanyl causing overdoses through contact may have triggered episodes of mass psychogenic illness [3]. So I'm inclined to take these gory images with a grain of salt, e.g. these may be a wounds that were neglected due to drug use versus unavoidably caused by it.
[1] https://en.wikipedia.org/wiki/Desomorphine#Toxicity_of_kroko...
[2] https://radiolab.org/podcast/good-samaritan
[3] https://en.wikipedia.org/wiki/Desomorphine#Toxicity_of_kroko...