Umm - ouch! Been there and felt that too after 24hour MTB race.
Best fix I found was the zinc baby butt cream (Curash brand here in Oz, but not sure what the equivalent brand would be there). It's icky, sticky, thick and white, but copious quantities on the nethers saw rapid improvement and then I used it as lube during the following rides too (on advice from a longtime rider). Worked a treat.![]()