I too have had an unexpectedly sore bum. Nothing to do with my Dirty Uncle Greg, I'm sure, but I don't know what caused it.
I sweat a lot when I'm riding, it's true, and I think salt has caused a bit of a problem, but I didn't even do 40km yesterday, FFS!
Usual bibshorts; normal saddle; everyday route.
I whinged a bit, but that didn't help, so I searched for some Savlon, but no luck. At Butterfly's suggestion (despite her sympathy, which was welcomed, she was probably bored of the whinging), I used J*A*S*O*N Witch Aloe gel - a mix of Witch Hazel (a stick of which I carry with me all the time, but I hadn't thought of trying
) and aloe vera. Very soothing, and seems to have cleared things up pretty much. I mean, I wouldn't want to head off on a long ride today, but last night, I was considering - the horror - taking the train to work
Worth checking out. We got ours from As Nature Intended, the hippy supermarket in Balham.