I've find the pictures of this man online as a "Hiroshima Survivor" but the only sources I could find tying him to the Hiroshima bombing are sketchy and non-credible (Pinterest, blogs, forum-history sites) I've put some links to the sources. Is this man actually a Hiroshima survivor, if not what is the story behind his deformity?
https://blogunik.com/dampak-mengerikan-jika-terkena-radiasi-nuklir-bagi-makhluk-hidup/
There are pictures of this man from different angles but essentially in the same setting, here are some examples:
The fact that the only sources tying him to Hiroshima are sketchy sites lead me to think that this is one of those cases where someone thought it looked cool so they added it to their blog about Hiroshima and then everybody else copied them and did the same.
Unrelated note: I've found an unusual amount of blogs in Indonesian, using this picture as a Hiroshima survivor.