Just about sums up exactly my situation that occured 2 weeks ago ... except I'm a few miles down the coast in Sarasota.Never had a problem in almost 3 yrs of cycling,no change to equipment etc.,etc.

Stopped riding for a week (used the gym instead!) and a liberal helping of Assos creme + Hibiclens antimicrobial cleanser after each ride seemed to have cured it and back to 150+ miles/week now.Have decided to change my saddle to a narrower design and this also seems to help me.My cycling colleagues tell me that I should ride harder since this will take more pressure of my butt - but then they are younger and stronger than me and it is April 1st!

Good luck!