Could be you just need to get used to sitting on a saddle, I know I go through that after I don't ride for a while. But in the past, even after I rode a lot I still had similar pain and went through a few saddles.
This year I looked for a new saddle and the LBS guy suggested I get my sit bones measured. I did, bought an appropriate sized saddle, and I have been much more comfortable. I recommend it to anyone now.
To get measured you just sit on a foam pad that your butt makes an impression in, get up and the dude measures the space between the 2 sit bone impressions.