Butt pain during riding I am an recreational cyclists and I like training, but on my last training ride I developed pain in my right buttock, I also got a bit of swelling, the area is on the back of the thigh just under my right buttock.

My background as a cyclist: I ride for several years mostly in the summer season, this season I have around 160 hours over the last 4 months and around 5000 km.

I must mention that in the same area I had saddle sores which now are solved because I am lubing the area before each ride with some sort of sports cream.

I suspect something is off with my riding position since it puts too much pressure on particular area, but it is strange as on the previous training ride I haven't felt any problem. I would like to avoid fiddling around with my saddle position as I haven't changed in the last 2 years at all.

Any idea what could cause this and how to manage it?
I would check your saddle. They can and do wear out and collapse. I had the same issue and it was solved with a new saddle.