I keep a container of Hibiclens in the shower, and if i start to feel anything during a ride, i make sure to use it. This is like super antibacterial stuff, and works really well, then dry thouroughly, and either powder your taint, or "bag balm" on it. Most small sores will be fixed in a day if you catch them early enough, if not you might have to take time off the bike. Also i don't think this has been said, but make sure you are wearing clean shorts everytime you go out.