Fore and aft adjustment of the saddle can also be an issue. When I switched from bullhorns to risers after a bike accident, I went from being stretched out to fairly upright and my saddle went from being nearly centered on the rails to pushed to the back of the rails. It took me a while to figure this out - baggier shorts probably caused the problem to get worse - and you just need some time out of the saddle to heal.

In addition to the recommendations already made, I strongly recommend showering after you ride and then applying shea butter to the sores. You want the good quality stuff that will spread on smooth and probably avoid the ones with perfumes in them. If you can't shower right after riding, do what you can to clean the sores. Even some clean water patted dry with a clean towel can help. Or use Witchhazel to clean if before going to bed or if it has been a few hours after you showered.