The man had visited the hospital complaining of severe, sudden onset lower back pain after picking up a heavy object three days previously.
An intravenous antimicrobial drip was used to treat the man and his condition improved, but he opted to discharge himself without allowing doctors to make an incision and drain the "collection" of fluid. He was also sporting a red rash and swelling on his forearm.
The 33-year-old told doctors that he had been giving himself monthly semen injections to "cure" his long-standing back pain, the report said.
The man also revealed that he had injected himself once a month for 18 months using a needle he had bought online. But the semen had pooled in the soft tissue of the man's forearm, leading to a bacterial infection called cellulitis.
"He had devised this "cure" independent of any medical advice, ' Dr Lisa Dunne wrote alongside images of his infected arm".
This case study was published with one mission in mind - to be educational and warn others against trying similar methods at home.
She found there were no other reported cases of intravenous semen injection found across medical literature.
Dunne wrote in the case study that she believed the semen injections was the first case of its kind.
"People are unusual", one person wrote on Twitter.
After dutifully reporting the first ever case of a man injecting himself with his own semen to try to treat his back pain, the authors offered a warning: It's risky for the untrained to perform intravenous injections on themselves, especially when they're injecting things that aren't supposed to be injected into veins, like semen.
The only past examples of semen injections mentioned in the journal were experiments done by injecting human ejaculate into rats and rabbits.
Dr Dunne concluded that this case demonstrated the "risks involved with innovative treatments".