The actor joined other celebrities including Jessica Biel and rapper Lupe Fiasco for the trek up the African peak in January (10).
But Hirsch's trip was almost cut short after an ingrown hair in his groin became infected, hindering his efforts to scale the mountain.
He tells JustJared.com, "I had an ingrown hair in my groin, so I couldn't walk! I don't like to talk about it because it got infected, there was pus and it was nasty. There was a 90 per cent chance they would have had to medevac (medical evacuation) me out of there but thankfully my condition improved and I finished the climb."