A Russian opposition politician was jailed for thirty days and then subsequently hospitalized for an “allergic reaction.
https://www.washingtontimes.com/news/2019/jul/28/alexei-navalny-russian-opposition-leader-hospitali/

His spokeswoman, Kira Yarmysh had said Navalny did not have a history of allergies and arrived at the hospital with severe facial swelling and red skin rashes.

Sounds like the after effects of a beat down. Most people tend to have an allergic reaction to an ass whooping.